Apollo casts a warning in the sky to her sisters to trust no one before succumbing to her wounds. Lune attempts to finish her but is stopped by Nikaidō. Keima, Diana, Elsie and Haqua have Apollo taken to the Katsuragi household where they discover the magic dagger used on Apollo and Kanon is ancient Weiss magic and the culprits are Vintage, a group of demons who wish to resurrect the Weiss. With Kanon having a week to live, Keima must find the other four goddesses to heal her before Vintage gets them. To accomplish this without incident, Elsie disguises herself as Kanon and Keima tricks his mother to go to South America. Partnering with Haqua who is disguised as Elsie, Keima uses the rumor of Kanon's confession to see the reactions of his prior conquests, who will act jealous if they remember falling in love with him. Keima narrows his suspects to Ayumi, Chihiro, Shiori and Tsukiyo Kujyo, who were all embarrassed around him.

Keima gets sick from a cold so Nora's partner Ryo is ordered to watch over him. With two targets left, Keima decides to use his cold to get Ayumi to visit him by calling her while he calls Chihiro not to come so both of them won't visit at the same time. At his home, Ayumi decides to stay to take care of Keima after seeing him sick. Just when things were going according to his plan, Chihiro unexpectedly visits no thanks to Ryo letting her in. With no choice, Keima hides Ayumi under his bed as Chihiro takes care of him while trying to simultaneously raise both girls affection. After Chihiro leaves the bedroom after singing her song for him, Keima tries to explain to an angry Ayumi nothing is going on between him and Chihiro. But Chihiro knocks on the door and confesses to Keima which he feigns ignorance before she leaves. Keima tries to call Chihiro but Ayumi contacts her first where she admits she heard Chihiro's confession and supports her.

Keima explains to the audience how he has captured fourteen girls and two unique girls after the last season. Meanwhile, Kanon is preparing for her school tests, but ends up talking with her split personality, Apollo, who claims to be a goddess. The next day, Keima and Elsie meet up with Tenri and within her, Diana. Diana wants Keima to marry Tenri as Tenri's love for Keima increases her powers, which he refuses. When asked to explain what she is, Diana reveals she is a goddess, one of the Jupiter Sisters, who helped the New Demons of Hell against the Weiss, when they attempted to take over the three realms of Earth, Heaven and Hell, and control all souls. After defeating them, the Jupiter Sisters sacrificed themselves by sealing themselves together with the Weiss, but they escaped ten years ago. Diana asks Keima to help find her sisters and reveals they reside in his past conquests, who did not forget their memories with him.

As Ayumi contemplates on what Keima said to her, Keima ask her to meet him at Kozue River. Haqua explains to Chihiro why Keima has to make Ayumi fall in love with him as he tries to make her like him again. However, their date is constantly interrupted by Vintage which Chihiro suggests she, Keima and Ayumi stay at Miyako's home.

Keima is bishōjo gamer who is called "The Capturing God" on the Internet for his ability to capture any girl in any bishōjo game but does not like girls in real life. One day, he accidentally accepts a contract with the demoness Elsie to help her capture evil spirits that have escaped from hell and have hidden themselves in girls' hearts with the only way to force these spirits out is to make the girls fall in love with him. Keima angrily explains to Elsie that he doesn't like girls and his "capturing skills" only work in games but is shocked to learn that both of them will be killed by the magical collars on their necks if he breaks his contract, forcing him to comply. His first target is his classmate, Ayumi Takahara who is training for the upcoming track-and-field meet. Keima cheers her on by displaying banners using Elsie's magical raiment at the field everyday. While Ayumi is annoyed by his actions, Keima believes she will eventually get used to him and like him. After a confrontation with jealous seniors, Ayumi sprains her leg a day before the meet. However, Keima confronts her that night as he figured out that Ayumi faked her injury because her meeting with the seniors made her question her confidence. Keima consoles Ayumi and tells her to believe in herself, which makes her fall for Keima. They kiss when Ayumi keeps Keima from falling down the stairs, forcing the spirit out of her body and allowing Elsie to capture it. Ayumi wins the meet but loses all of her memories with Keima, though she blushes when Keima congratulates her. Much to his confusion, Elsie has transferred to his school, claiming to be his sister.

Chihiro and Keima head to the rooftop to continue their date. As they are about to kiss, Chihiro asks him to be gentle as this is her first time, which leads Keima to realize that Chihiro doesn't have a goddess as she does not remember her first kiss with him.

As Kanon prepares for her concert, she soon gets second thoughts and fears she will mess up and be forgotten again which she turns invisible and leaves the stadium which sends the backstage staff looking for her. As the concert draws near, Keima finally finds Kanon at a nearby building. Keima knows why Kanon fears of being unnoticed but tell hers she shouldn’t seek people’s attention as proof as an idol as her hard work to become one was the proof all along. With his encouragement and her fans cheering for her, Kanon returns to the stadium, thanks Keima and kisses him which causes the spirit in her to leave and finally be captured by Elsie. As she about to go on stage, she learns her former bandmates from Citron, Yuri and Lime, have sent their congratulations to her for making this far and Kanon makes an amazing performance to the crowd. As Keima and Elsie leaves, he tell her his views on idols hasn’t change but views Kanon as a shining star.

As they head to Ayumi's location, Chihiro tells Keima he should tell the truth to Ayumi as unknown to Keima, she already told Ayumi that he was trying to win her heart for something important. At the harbor, Keima tell Ayumi he will honestly tell the truth if she ask anything before continuing their wedding.

Keima confronts Elsie on why she’s still here and he still has the magic collar on his neck which the latter reveals that their contract is still not finish and the collar will only be removed until they capture all of the runaway spirits in the city. After meeting Keima’s mother, Mari, Elsie claims she is her “husband’s illegitimate child” which Mari snaps on her husband on the phone for his “infidelity” and allows Elsie to stay with them. Keima however, refuses to accept Elsie as his little sister as in his view, she doesn’t have the requirements that qualify her to be one which she tries to impress him albeit unsuccessfully. But upon hearing her story on wanting to be successful just like her older sister, Keima reluctantly accepts Elsie as his sister. During lunch at a popular food stall, Keima and Elsie find their next target, Mio Aoyama, a rich girl who proceeds to buy all of the yakisoba sandwiches. Keima believes she is an easy target as she has all the characteristics of a Tsundere, and a love confession might break her hard shell. However, the confession doesn’t work as planned, and Mio has her chauffeur beat Keima badly. As Keima and Elsie follow Mio to her home, they are surprised to learn Mio lives in a shabby apartment.

While attending a meeting between the section chiefs in New Hell, Haqua questions Dokuro Skull if Vintage have infiltrated the spirit hunters which the latter denies. However, Haqua is arrested by Public Safety which she later learns to her shock from Nora that Vintage have also infiltrated the highers ups and Dokuro Skull was the one who ordered her arrest. Back at Earth, Keima gathers all the awakened goddesses at his house in order to undo the spell casted on Kanon and awaken Apollo. During the ritual, Keima is brought to Apollo's realm. There, Apollo reveals she cannot leave now as she stopping the power of the Weiss from spreading the city but can only do so for three more days. Kanon and Apollo put their faith on him and grow their wings before he returns back home. While Majima High prepares for their upcoming festival, Ayumi becomes a participant of a pageant as Chihiro invites Keima on a date.

Still upset over what happened at class, Jun goes to watch a pro wrestling match only to find Keima sitting at her seat thanks to Elsie making a copy of her ticket. As she is forced to sit with him to watch the match, Jun wonders why the class won't let her help them, which Keima then asks her why the girls basketball team disbanded when she was captain and correctly concludes that it was her idealism that forced the other members to quit and despite claiming she was trying to help the team for them, she was actually helping them for herself which Jun leaves the match in anger. Despite this, Keima concludes it's time to capture her heart. Later, Jun tells the class she has entered them for a marathon hoping to help them bond, but instead they refuse, feeling that she's trying too hard on them, which leaves Jun disappointed and tells the class how selfish they are before running away. As the class bad mouths Jun, Keima unexpectedly calls out on their behavior and disappearing before they confront him. As Jun arrives at the old girls basketball team locker room, Keima confronts her, telling her despite claiming to have changed in order to teach her idealism to others, she still hasn't changed at all. As she runs away into the school gym crying and wondering why people won't let them help her, Keima consoles and tells her to not give up and try harder as it will finally make them accept her idealism. Just then, the whole class arrive in the gym to apologize to Jun much to her joy. Unknown to Jun, Keima knew what was going to happen so he planned with Elsie to have the class to start hating him after Jun left and made them worry about her after she was gone. As Jun's time as a student teacher comes to an end, Keima sees her off and asks her to come back which she promises to become a better teacher and kisses him, finally expelling the spirit inside of her.

This episode features 4 different perspectives happening on the same day. Elsie is angry that Keima called her useless for making his lunch despite "it" having bizarre ingredients that are still alive. After her friend Chihiro advices her on how to impress Keima, Elsie decides to make a strawberry cake for him. Unfortunately, she mistakenly uses ingredients from hell instead of normal ones which causes many accidents including releasing a Mandragon and blowing up the Home economics class. At the same time, Keima irks the english teacher Kodama who dislikes the fact Keima constantly play games in class, yet still manages to get a perfect score on his test. After getting into an argument with Keima over games and real life at PE class, Kodama is chased by the Mandragon. Meanwhile, the Mandragon arrives at the Katsuragi's residence where it drops Elsie's cake. Keima returns home and finds Elsie's cake and eats it out of guilt but get hit on the head with a vase by his mother who mistaken him for a thief due to the Mandragon, which is eaten by the "lunch" Elsie made earlier which then chases after Kodama, forcing him to cancel his meeting with Mrs Katsuragi. Elsie returns home, vowing to make another cake for Keima but he reveals he has tasted her cake and doesn't like sweets much to her chargin.

Keima attempts to finish and get the heroine, Sora Asuka from the PFP Bishōjo game "Crayon". But the game has many bugs including one that loops a previous scene over and over again. No making things any better is the fact saving the game only crashes it and game company that made it is now bankrupt thus there are no patches to fix the game. In order to avoid the bug loop and finish the game, Keima forcefully enlists a reluctant Elsie to help record the choices that he made in the game. Elsie is at first confused on why Keima takes the game seriously but soon respect his dedication to help the girls in his games just like the girls he helps in real life. After many attempts, Keima finally manages to avoid the loop bug and goes to the next scene but unexpectedly gets into another bug, resolving him to try again much to Elsie's horror. A wikipedia article about "Crayon" reveals a rumor that someone managed to get the ending, hinting Keima was able to finish the game.

Due to helping Elsie capturing spirits, Keima has gather a large backlog of new games he hasn't played. So on Sunday, he plans to finish all the games in his room by playing 6 games at the same time by going into "God of Conquest Mode" which enables him to play multiple games at the same time with impressive speed, while still managing to logically make the right choices and enjoy each game individually but suffers from Burnout later. Elsie finds this impressive yet bewilder and leaves him alone. Realizing he cannot finish all of his game at this pace, Keima decides to up the ante by playing 24 games at once while in "God of Conquest Mode". Keima finally manages to finish all of his backlog games except one as he is too tired to continue but he soon start hallucinating where all of the game girls he captured encourage him not to give up. Rejuvenated, he finally finishes the last game and "follow" his game girls into the game world where they all sing and dance together. The episode ends with an announcement for the second season of the anime and a new character introduced.

Keima orders Elsie to go to the school library to learn modern human history after learning her knowledge about human history is two centuries out of date. Instead, she becomes fascinated on a book about Firetrucks. When she looks for more books about Firetrucks, she ask one of the librarians, Shiori Shiomiya and detects a spirit inside of her. After bringing Keima to library, the two are amazed that Shiori manage to find 458 books related to Firetrucks. While Keima thinks Shiori used the library index, Shiori, deep in thought, wants to tell him she was able to find them as she remembered all the books she reads in the library but is too shy to speak up. The next day, Shiori arranges the books in the library and explain her love for books. Keima is aware how shy librarian girls like her are easy to figure out as they are a common character in games but unlike games where he can read what the character is thinking, finding out what Shiori thinks might be more harder. As Shiori removes some books to be dispose off and laments to herself about their fate, Keima helps her get one book she can't reach. Shiori tries to think on how to thank him but fumbles in her words while thanking him.

Shiori is having trouble finishing her novel for the Mai High Festival due to her conflicting feelings for Keima. She then notices a young girl, who is actually her goddess, and chases after only to meet up with a crossdressing Keima. As she inquires his crossdressing and eat at a Ramen shop, Shiori tells Keima that she wants to make a story of him. Keima explains to Haqua that with Shiori's boosted confidence after their talk, she can now finish writing her novel. But the next day, Shiori is suffering writer's block so Keima decides to stay with her at the library to help her. After several drafts and procrastination by reading books, Keima eventually tells Shiori to write about herself especially when they both lock themselves in the library. Realizing Keima was there and kissed her during that time, Shiori starts writing. The next morning, Keima reads her story about her life at the library which ends with her declaring she loves Keima.

Elsie is glad to meet her friend Haqua, a genius who was one of the best students in their class and is now the Section Chief of District 32 of the Far East Division. When Elsie ask Haqua how many spirits she has captured, Haqua claims she captured ten and is in disbelief at first when Elsie says she captured five as she always known her as a klutz. But their conversation is interrupted when Elsie's boss, Chief Docrow, reports an evil spirit is on the loose in her area due to a failure of another spirit hunter. Haqua decides to capture this spirit by herself but Keima, after hearing her talk with Elsie and seeing her suspicious attitude, tells Haqua that he knows the spirit hunter who let the spirit loose was Haqua herself as she was chasing it before she meet Elsie and Docrow reported it. While Keima isn't interested on why Haqua is keeping it a secret from Elsie, he offers to help her find the spirit at school in exchange for telling him what the evil spirits are. Haqua explains the spirits are the souls of the Old Demons of Hell who were overthrown and sealed by like-minded Demons who were oppose with the former's wicked ways but managed to escapes to Earth and hide in girls hearts which the spirit hunters are tasked to capture them before they are reincarnated as their host's child. Since the spirit feeds on negative emotions, Keima leads Haqua to the most depressing place in campus, the school theater. Keima decides to leave everything to Haqua but she needs his help and admits to him that she hasn't caught a spirit yet and lied to Elsie to save face. Is then when Elsie reports to her that she has found the spirit in the theater.

While playing his recently bought dating sim games, Keima plays one called "One Leaf". At first, he assumes it's a terrible game due to it's horrible character design but quickly falls in love with it's heroine, Yotsuba Sugimoto, aka "Yokkyun", as she is his ideal game heroine. Keima enjoys the game so much, that he decides to play it at a slow pace, ignoring everyone throughout the whole day much to Elsie's chargin and Haqua's confusion. Later that night, Keima receives an email from the game studio that created "One Leaf", who asks Keima to help them create the perfect dating sim game under his direction. As Keima think of ideas for the game, his inner minds soon starts arguing over what is the ideal and perfect dating sim which leads to an intergalatic war. But the war finally stops when all of them remember about Yokkyun and what is important that makes the perfect dating sim game. Finally making a decision, Keima decides to tell the studio to just make a good game. As the season finale come to an end, including a preview of the new cast of heroines for Keima in the next season, Keima ends the episode saying he used to think games were the ideal world and real life was just a bad game. But after learning that a perfect world can be found in a bad game, then he can also find it in real life as well.

Keima and Elsie realized that Kanon is actually turning invisible because of the spirit inside of her and he manages to stop Kanon from tazing him again by praising her song. As Keima sends Elsie to investigate, they learn Kanon was once a member of the pop idol group Citron before they disbanded and has never played any songs from her old band and Kanon's need for attention was the result of people not noticing her in the past. Keima later receive an email form Kanon and cheers up the depressed Kanon at her TV shoot. Kanon continues sending Keima an obsessive number of emails to visit her whenever she feels depressed. With the relationship going smoothly, Keima agrees to come to Kanon's Christmas Eve concert at Narusawa Seaside Hall. On the day of the concert, Kanon is nowhere to be found and Keima know it's time to go to the final stage of his plan.

Keima sends Tsukiyo home warning Vulcanus not to reveal herself while he searches for the other goddesses. Unexpectedly, Yui has come to Keima's home to ask him out. Keima explains to Haqua he must now conquer Yui before Vintage realizes she has a goddess. The next day, Keima crossdress as a girl which gains Yui interest to awaken her past memories while unknowingly being overseen by Shiori. After Keima asks her out for a date, the goddess Mars finally awakens inside of Yui. As the crossdressing couple spend time together on their date at an amusement park, Keima is kidnapped by a Vintage agent. Wishing to save Keima, Yui's love for him finally restores Mars' powers which she defeats the agent who is revealed to be Haqua which was a part of Keima's plan to awaken her powers. Yui proclaims her love for Keima and kisses him, which restore Mars' wings.

Haqua arrives and tries to capture the spirit which has gotten powerful from feeding the negative emotions of the unconscious students around them but the spirit escapes to the roof by possessing the students to stop Haqua and Elsie. Keima suggests Haqua should team up with Elsie but Haqua refuses, claiming she is more better than her. However, Haqua is in distraught as she has failed to live up to her friends expectations which allows the spirit to possesses her. By the time Keima and Elsie reach the roof, Haqua is under the spirit's control and it uses her and the possessed students to capture them. In order free Haqua from the spirit's control, Keima tells Elsie to calm the negative emotions in Haqua's heart. As Elsie talks to her, Haqua admits to Elsie that she lied to her as she was ashamed and didn't want let her down but Elsie breaks free from the possessed students and hugs Haqua, telling her no matter what, she will always been the greatest demon in her eyes which finally breaks her free from the spirit's control. Now working together, Haqua defends Elsie from the possessed students while the later uses the spirit capturing bottle to capture the spirit which they succeed. With the spirit captured and returned to her, Haqua thanks Keima for his help and for not revealing her lie to Elsie while Keima congratulates Elsie on a good job which she celebrates by buying both Keima and Haqua lunch.

Jun Nagase is an idealistic and upbeat new student teacher at Majima Academy assigned to her senior's class, Miss Nikaidō, Keima's teacher. Jun is at first bewildered that Keima is playing video games in class and nobody minds about it but after the teachers tell her the problems they have to deal with him, Jun believes Keima is a problem child and wants to help him. She goes to talk to him but gets scared looking into his eyes and leaves. Convinced that Keima is actually lonely, she resolves to help him open up which at the same time a spirit enters her body. When Keima and Elsie learns about Jun's spirit, Keima finds his next target difficult as making of a teacher falling in love in games takes too much time as teachers never fall in love with their students as they only see them as their students only. Thus in order to make Jun fall in love with him, he has to make Jun see him as her equal in a short amount of time. As Keima leaves school to figure out his plan, he is caught by Jun who thinks he's ditching school. After dragging him to have lunch with her and talking about her idol, the late pro wrestler Jumbo Tsuruma, Jun tell Keima to talk about his problems to her. However Keima does not like this unprecedent event since it will take too long for him to capture Jun's heart.