Kaname confronts Agent Wraith about Sousuke's departure, but as she is about to get answers, Xia Yu Lan ambushes the two. Kaname outwits her pursuer until Leonard Testarossa, another Amalgam agent who is also Tessa's brother, shows up and kills Xia Yu Lan. He reveals that the assassin was a rogue agent acting outside of Amalgam's interests.

Still demoralized by Gauron's claims of killing Kaname, Sousuke still refuses to function until Kaname finally appears to get him back on his feet. Inspired by her presence, Sousuke pilots the Arbalest again to destroy Gates and his men. Kaname returns home to Japan. Sousuke faces the Mithril command, which grants his request to stay with Kaname even if his wages are reduced.

Xia Yu Fan leads Sousuke to Gauron while she runs off to fight Clouseau, Melissa, and Kurz in Hong Kong as Northern and Southern China teeter on the brink of hostilities. Now crippled and about to die, Gauron explains the truth about Amalgam and taunts Sousuke by claiming to have killed Kaname because it changed him into someone weak. Enraged, Sousuke kills Gauron and gets out of the building just as a bomb under his bed explodes. Gates and his Amalgam team also arrive to kill Xia Yu Fan. Tessa launches the Arbalest despite Mithril's orders not to.

Mithril attempts to learn more about the mysterious Amalgam organization. Sousuke and Kaname's relationship begins to blossom; however, the Mithril leadership forbids him from seeing her after his bodyguard duties are assigned to another agent.

A secret admirer leaves a love letter in Sousuke's shoe locker. Instead of finding the letter, he deduces that his locker was tampered with and promptly blows it up. From its fragments, Sousuke misinterprets the letter as a death threat and confronts his "stalker". Sousuke forgets Kaname's notes at home, and they make a frantic dash to retrieve them and return before lunchtime ends. Despite their tardiness, they find out that the notes were not needed since their teacher coincidentally fell sick.

Sousuke orders a new scope for his pistol, but receives a strange bottle instead. Unfortunately, the contents are a biological weapon. Even worse, the bottle is opened up in the school!

Sousuke argues with his replacement, Agent Wraith, about the mission to protect Kaname. Kaname wonders why Sousuke has not been attending classes in days and starts to become worried. When she needs to see him after a chance encounter with Amalgam agent Xia Yu Lan, she finds his apartment vacant and he has disappeared.

The SRT travels to Sicily to capture the traitor from the Nanjing operation. Sousuke has difficulties balancing work and school when he tries to have a phone conversation with Kaname and to drive a getaway vehicle at the same time. A mysterious AS also appears to help the team get away. Seeing the stress of his everyday duties, Mao decides to ask Sousuke about his own plans for the future.

Sousuke comes to Kaname's rescue, and the rest of the rescue team arrives on the scene as well, but can they hold off the army and save the students? Can Sousuke get Kaname to safety?

Sousuke continues to wander in Hong Kong and encounters a prostitute who looks very much like Kaname. Tessa is "forced" by Admiral Jerome Borda to deploy Clouseau, Melissa, and Kurz to the island after sightings of the Venom AS are confirmed.

Xia Yu Lan's twin sister, Yu Fan, hijacks a Venom AS to become an agent provocateur between the Northern and Southern Chinese Army units in Hong Kong. Sousuke and Melissa are deployed by Gavin Hunter to the area in a team of SRT/PRT personnel of East Asian origin to find the AS, but his feelings for Kaname nearly places the Mithril reconnaissance force in danger. After a tough sermon from Melissa touches a raw nerve, Sousuke deserts the team.

During a day at the beach, Kaname becomes upset at Sousuke's insensitivity. When she goes off alone, she is asked to have tea with a boy who is enamored with her. Sousuke, however, believes that she was kidnapped and proceeds to rescue her from her apparent kidnappers.

Sagara and Kaname barely escapes from the enemy. Now on the run they try to find a way out. Deep in the forest Sagara isn't able to move much more with his injuries, so Kaname decides to stop and rest for a bit. After Sagara was able to stop the bleeding, Kaname realizes how dangerous and mysterious Sagara really is. To make matters worse they find an unexpected person along the way, it's Kurtz, who looks badly beaten by Gaul. As the 3 try to make to the shoreline they find themselves in a tight pinch; the forest ended and all there is now is plain fields. Not Knowing what to do Sagara had only one idea left - to have himself and Kurtz distract the enemy force while Kaname makes a run to safety. But Kaname refuses to leave.

Mithril is perplexed at how the enemy is able to follow their movements. Once they realize that their communications have been compromised, Tessa and Commander Andrei Kalinin give false orders to facilitate the rescue and turn the tables on Amalgam.

Sousuke and Kazama investigate who is posting embarrassing and revealing pictures of Kaname on the internet. Meanwhile, Amalgam operatives led by Gates extract payment from the Balic military force that took on Mithril and try to reconstruct what happened in the battle.

Zaied outwits Sousuke's team and interdicts their advance! Zaied's team surrounds Sousuke's team who is carrying a nuclear warhead. Zaied moves first. While Sousuke is fighting against Zaied, Gray and the team are aghast at the power of Gauron.

During a field trip to the park, the class selects Sousuke to be the model for their art project. However, Sousuke misinterprets the modeling advice he receives from their art teacher, turning the assignment with his classmates into a game of life-and-death. Kaname goes on a date with a former classmate to an amusement park while Sousuke and Kyoko follow her. Sousuke seems relieved that she's simply on a date until a drunken yakuza group threatens Kaname. Not wanting to reveal that he was following her, Sousuke comes to the rescue disguised as the amusement park mascot.

Mithril and the SRT rescue refugees caught in a civil war in the African country of Balic. However, during the fighting, they discover that the enemy possesses advanced weaponry rivaling their own. They surmise that a highly funded, well-equipped organization may be supplying their enemies.

Sousuke makes his way to the city of Namsac, where people bet on fighting matches between decommissioned Arm Slaves. Thanks to a bit of serendipity, he meets a team owner named Nami at the arena just when she's looking for an AS operator.

Kaname, Sousuke, and the gang use summer break as an opportunity to visit the Narushino military festival, and during the annual AS competition, Sousuke helps give the underdog an advantage.

Sousuke who are attacked by amalgam. Raids also come closer to Sousuke who cannot heal wounds yet. On the other hand, Tessa who missed Fowler slightly afterward pledges Leonard and amalgam.

Lemon determines where Kaname is likely being held captive, so Sousuke and his ragtag group launch a rescue mission. But many forces are on the move this stormy night, and the mission doesn't quite go according to plan.

While enjoying considerable success fighting in the arena for Nami's team, Sousuke starts to grow accustomed to his new life in Namsac. But little things keep reminding him he came to this city with a specific purpose in mind.

Amalgam decides it's time to get serious about its Mithril problem, and this means big challenges are on the horizon for Sousuke, Kaname, and Tessa. As enemies close in on all fronts, will they find ways to overcome those challenges?

When Tessa is found wandering dazed and barefoot on a California highway, her attending psychiatrist just might be in for the case of a lifetime. The story Tessa tells sounds like an intricate delusion, but sometimes truth is stranger than fiction.

Sousuke and Kaname ask the school's karate club to vacate their dojo, which is slated for demolition. However, the club refuses to leave, challenging Sousuke to a duel where they'll leave if they lose. Sousuke defeats the club's members with relative ease until he faces the club's captain. As a test of superiority, Sousuke and the karate club's captain compete to care for the injured school janitor; however, their overzealous efforts do more harm than good. The janitor tries to be patient, but finally goes berserk when they accidentally serve his prized koi pet to him for dinner.

Gauron manages to escape thanks to the betrayal of two soldiers. Gauron takes Kaname hostage and takes over Dana, the AI of the De Danaan.

Sousuke spends most of the budget for the school festival. Kaname gets so disappointed. It might have been his apology? He invites her to "go to a southern island", but the destination is not what she is thinking...

Sousuke and Kaname work together to save Kyoko and everyone else at Jindai High, and they both reach a point where they must make difficult, fateful decisions. Tessa likewise tries to save as many of her people as possible as she abandons the island base.

Trouble brews on the Tuatha de Danaan. Gauron has taken control of Dana and isolated the crew into the back half of the ship. Tessa and Kaname are held prisoner on the bridge, helpless to stop Gauron.

The Mithril assault team finally begins to take Sousuke's advice into account, but it may be too late: Gauron has one of Sousuke's old comrades predicting what Sousuke will do.

Kaname is in a bad mood after seeing Tessa emerge from the bath. Unfortunately, even as Sousuke Sagara tries to explain that things aren’t what they seem, Tessa finds a way to make the situation worse.

The SRT team has its hands more than full trying to protect Merida Island from three rampaging Behemoths. Sousuke and Kaname attempt to deal with their own frantic situation, as Amalgam's Kurama drags the students of Jindai High School into the fray.

Tessa and Mao decide the best way to settle a big argument is with an AS battle! While Mao is calm and composed, Tessa desperately seeks training from Sousuke.

The Crossbow team takes part in their first illegal battle, but nefarious forces are at work behind the scenes. If Sousuke doesn't play his cards right, this first battle could end up being his last.

Flashbacks of Kurz and Sousuke's time as trainees.