Itsuki arrives late for an appointment at a shrine due to allowing Mikan to buy souvenirs at a festival. The request is from Shinogi Minagi, who requests a saniwa, or spirit medium to convene with Futsunushinokami, the god of the shrine, in order to revive her comatose brother, Moroha Minagi. Although Adilisia and Honami are against Itsuki taking the job, he agrees after seeing Mikan's enthusiasm for doing it. However, as the ritual is being conducted, Kagezaki, a member of the Association, arrives, and tells Astral member Manami Kuroha of Takeminakatanokami, the other god of the shrine. He tells of the incident where Shinogi and Moroha summoned Takeminakatanokami, but Moroha was forced to invoke Futsunushinokami's power to stop him, leaving him in a coma. Mikan, with emotional support from Itsuki and an arrived Honami, manages to seal Takeminakatanokami, and Moroha awakens. On the train back, Kuroha teases Honami for caring about Itsuki and showing up to save him.

Itsuki is in the hospital with a broken leg, where he converses with Manami Kuroha, a ghost inhabiting the hospital. Kuroha is overjoyed that someone can talk with her, and she asks Itsuki about Astral and its workings. Meanwhile, Honami and Nekoyashiki investigate a source of magical pollution near the hospital. Nekoyashiki comes to Itsuki, and dispels a set of bloody hand prints. Honami arrives and the three determine that a dead mage is the cause of the pollution. Elsewhere, Kuroha is consumed by a mass of flesh, and it attacks Itsuki, Honami and Nekoyashiki. They determine it was the result of a mage attempting to acquire immortality by eating souls. As they prepare to destroy it, Itsuki reveals his Glamsight, and the three succeed in rescuing Kuroha. A few days later, with the members of Astral present, Itsuki invites an overjoyed Kuroha into Astral.

Due to the low amounts of jobs Astral has taken since Itsuki took over, Kagezaki threatens to disband Astral if they do not take on a difficult mission. They are assigned to remove the magical pollution creating a vast sea. Goetia arrives as well, and summons a host of birds to attack Honami and Itsuki. Honami dispatches the birds, and Adilisia arrives. However, the sea engulfs Adilisia and Itsuki and then freezes, trapping them. Below the ice, Adilisia reveals that the pollution is caused by a Goetia member that broke a magical taboo, becoming magic, and swears Itsuki to secrecy. The mage is revealed to be Oswald Lenn Mathers, Adilisia's father. He attacks Adilisia and Itsuki, but Honami's arrival saves them. Oswald withdraws and Itsuki makes Honami promise not to reveal the pollution's source before fainting.

Itsuki meets a girl in a park, and seeing her alone, gives her his food and his business card. She later goes to the Astral residence, asking to obtain a basilisk eye, shocking the Astral members. However, with the offer of a valuable gold coin, they accept. They proceed to the basilisk's lair, where the basilisk manages to trap Lapis and Itsuki in a room, and subsequently overwhelms Mikan's protection charm. Itsuki then reveals his Glamsight, and the Astral members dispatch the basilisk. Itsuki then collapses from the magical pollution, and Nekoyashiki barely manages to purify him. Later, Lapis arrives at Itsuki's bedside, and after arguing with Mikan and Honami, who realize she is a homunculus, destroys most of the room in an explosion. Nekoyashiki then realizes that she is being controlled by Yudaikus Tholoide, one of the founders of Astral.

he Astral members go to a hot spring in order to cure Itsuki's eye, as hot springs are situated on magical ley lines, but note that the magic is too weak. They travel up the mountainside, and Kuroha suggests a competition to find a ley line. Honami and Adilisia claim they are above it, but note that they would both want Itsuki's affection as their prize. When the competition starts, Honami and Adilisia try to find the hot spring, tearing the mountain apart in the process. The group then falls into a hole, where they find a rock that is causing the ley line to break. Combining their abilities, they levitate the rock, enabling the hot spring to regain its power. As the members return to the hot spring, Honami and Adilisia's fight causes the fence between the men's and women's baths to break, embarrassing everyone.

Adilisia raids Tholoide's lab, but is defeated by Tholoide and Lapis. Back in Japan, Kagezaki brings an item once owned by Tsukasa Iba, Itsuki's father, that the Association was holding to Itsuki, but reveals that Tholoide is disputing Itsuki's control of Astral. Itsuki and Honami go to a blimp to converse with Lapis, whom Tholoide speaks through. Tholoide concedes the ownership of Astral to Itsuki, but the two agree to battle to determine ownership of the item. After Tholoide claims that Adilisia is dead, Honami attacks Lapis, and Itsuki unveils his Glamsight. Lapis manages to escape, but Tholoide acknowledges Itsuki's power. Later that evening, the Astral mansion is attacked by Lapis, with Nekoyashiki barely managing to create a barrier against the initial assault. Honami flies from the mansion to meet Tholoide, who reveals he is an automaton. He then knocks Honami to the ground with a punch.

Lapis uses her basilisk eye to steal Itsuki's sight, preventing him from using his Glamsight. However, she retreats after Adilisia arrives, and Adilisia dispels Lapis' spell. Elsewhere, Honami awakens in Tholoide's lab surrounded by a barrier, and Tholoide reveals the item the Association was holding was Tsukasa Iba's grimoire. Itsuki plans an assault on Tholoide's headquarters, and Honami, realizing Itsuki is coming, desperately tries to break the barrier using a spell with her blood, but Adilisia's arrival makes it unnecessary. Itsuki confronts Tholoide, who easily defeats the Astral members with the basilisk eye he took from Lapis. Honami and Adilisia arrive, and Tholoide transforms Lapis into a basilisk to fight them. Itsuki manages to resist the eye's effect, revealing his Glamsight. He frees Lapis, telling Tholoide that as president, he can only aspire to be the best he can.

Astral is approached by Diana, the president of the magic items provision corporation Trismegistus, to find a special flower that is seeded within a human body and blooms after their death. As the mission was originally taken by Itsuki's father, Itsuki accepts. However, they are attacked by Li Cheng Chen, a magician that can raise the dead. He tries to take the flower, but Honami takes it, escaping with Itsuki, leaving Kuroha behind. Itsuki resolves to save Kuroha and retain the flower for Diana. Elsewhere, Diana approaches Chen, regretful that she sold him the root for the flower, as he killed a village to seed it with power. Itsuki arrives, and Kuroha manifests her poltergeist powers to free herself from Chen's imprisonment. Itsuki reveals his Glamsight and he, Honami, and Kuroha defeat Chen. At the Astral mansion, Diana thanks Itsuki and while looking at his eye, comes close to his face. A scandalized Honami and Kuroha punch Itsuki after Diana leaves.

Astral is contacted by Kei Isurugi, a member of the school of Onmyōdō that Nekoyashiki once attended, to perform a ceremony at a mountain. Itsuki accompanies Nekoyashiki and Mikan, but they are attacked by Kei during the ceremony. Kei remarks that he lost his sister, Sakuya Isurugi during a similar ceremony three years prior because Nekoyashiki left the school at the time to take Mikan to Astral. Nekoyashiki challenges Kei to a personal duel, and Itsuki upholds this, stopping the arriving Honami and Adilisia from interfering. Despite Kei's use of kuda-gitsune, Nekoyashiki manages to defeat him, with Kei pleased that he was able to pose some level of challenge for Nekoyashiki, his idol at the school. As Kei lies in defeat, Nekoyashiki reminisces on his last experience with Sakuya as the group watches an aurora in the sky.

Shinogi and Moroha Minagi request that the Astral members return a funadama they found to a shrine on a beach. When Itsuki and Kuroha attempt to return it, they are sucked into the past due to the magical pollution in the area. They meet a fisherman, Hyōdō, who explains that he has been attempting to find a mermaid due to the miraculous healing abilities their flesh gives when it is consumed. In the present, Honami, Adilisia, Mikan, and Nekoyashiki are told the legend of the mermaids from an old woman, who recounts that mermaids return to eat those that consumed them. Itsuki and Kuroha are subsequently attacked, and Kuroha manages to call upon the spirit of Hyōdō's wife, which materializes in a funadama, causing the mermaids to chase after it instead, and Itsuki and Kuroha return to their own time. Later, Shinogi recounts that the shrine is being worshipped again, and Itsuki realizes it is likely one of Hyōdō's descendants.

While training in the mountains, Itsuki is attacked by a larva, a magical creature that makes nightmares reality, and is saved by Sekiren, a traveling member of Astral. On Itsuki's request, Sekiren trains him in martial arts. In a break in training, Sekiren visits Astral and asks Nekoyashiki to allow him to take on a mission offered to Astral. Kuroha takes tea to Itsuki, who claims that he is training so that others can rely on him. Magical pollution appears on the mountain, and Kuroha leaves to seek help, but after she and Honami return, Sekiren stops them. Meanwhile, Itsuki is attacked by the larva in the form of an armored soldier, and using Sekiren's training, is able to defeat it without using his Glamsight. Afterwards, Sekiren reveals he set up the conflict for Itsuki's benefit, and advises him to fight with his Glamsight rather than have it control him.

Daphne begins searching for Clive in order to find Adelicia, meeting Gara, Goetia's secretary, in the city. Gara is not aware of Clive's location, but after he leaves, Sekiren appears, and Daphne attacks him. Sekiren explains he wishes to help Daphne with her search, and after witnessing Daphne's abilities, questions why she lowered herself to being Adelicia's servant. Daphne replies that she is content to be Adelicia's servant, although she is embarrassed when Sekiren declares his love for her. The two eventually find Clive dead, and confront Gara over killing him. Gara uses forbidden techniques to fuse with a demon, causing Sekiren to realize that he is part of Ophion, an organization of mages that do not follow magical taboos. Sekiren defeats Gara and forces him to retreat.

The oni traps Kaori and is subsequently trapped in the Katsuragi ceremony; however, Kaori receives severe pain when the Katsuragi clan members remove one of the oni's horns. Suzuka calls Mikan to be a sacrifice, but the oni breaks free of the ritual. Itsuki, Honami, Nekoyashiki, and Tatsumi arrive and offer to combat the oni, which Suzuka agrees to, although she dismisses any possibility of victory. Using his Glamsight, Itsuki directs Honami in sealing the oni's movement while Mikan and Kaori complete the Katsuragi ceremony. The oni's remaining horn enables him to halt the ritual, but Adelicia arrives, removing the remaining horn with one of her summoned demons. Mikan and Kaori complete the ritual and cause the oni to vanish. Impressed with their feat, Suzuka allows Mikan to return to Astral and requests that Itsuki take good care of her.

Sekiren becomes concerned after the Sekiren is disturbed by the errosion of a Buddhist idol that crumbles under his touch. Itsuki and Adelicia are enjoying a date. Itsuki and Adelicia are discussing Honami's diligence in resurrecting the lost arts of Celtic Magic and are about to have an intimate moment but are interrupted by Fin Crue who has managed to save Nekoyashiki's cat Genbu but in the process got himself stuck up a tree. On returning to Astral's headquarters, Nekoyashiki rewards Fin with a generous helping of Cream Puffs. Honami returns with Mikan, who is home early from school, and it is revealed that Fin is in fact aware of Itsuki's status as Astral's President, was instrumental in Honami's resurrection of Celtic Magic and claims to be on assignment from the Association to investigation regarding a the breaking of Taboo that Itsuki's involved in somehow. Fin ends his investigation but is followed by Itsuki on leaving.

Honami travels throughout the city, writing runes in her blood for the dragon summoning ceremony. Nekoyashiki explains to the remaining Astral members that Itsuki's father, Tsukasa Iba, chose for Astral's headquarters to be in the city in order to keep watch over the dragon, and he casts a spell to retrieve Honami and Itsuki. Elsewhere, Adelicia confronts Fin, who overwhelms her with his magic. Itsuki and Sekiren arrive and Fin quickly disables the latter. Fin reveals that he is a changeling and possesses the Glamsight, which knocks Itsuki unconscious. Nekoyakishi's spell reaches Itsuki, Sekiren, and Adelicia, but Fin disrupts it, causing the spell to leave Itsuki behind. Honami and Fin take Itsuki to a tower, where they begin to summon the dragon. Nekoyakishi surmises the dragon is a sacrifice to heal Itsuki's eye, and that Honami feels guilt over exposing Itsuki's Glamsight to damage from the dragon when they were traveling in a mansion as children.

The members of Astral go to the tower, and are confronted by the dragon. Sekiren, Mikan, and Kuroha begin to battle it, and the others continue into the tower. Nekoyashiki arrives first, but is stopped by Fin's and Honami's combined efforts. Adelicia enters the battle and summons Asmodai, her most powerful demon, and Honami responds with one of her most powerful spells. Nekoyashiki stops the confrontation to prevent the area from being destroyed from the accumulation of energy. Itsuki awakens, revealing his Glamsight and admitting to Honami that he does not blame her for their childhood incident with the dragon. Itsuki and Fin battle, and as Fin conjures an unblockable attack, Honami betrays him, declaring her love for Itsuki. The Association members, headed by Kagezaki, begin to arrive on the scene, and Fin retreats.