It's tough to keep your grades up without having to take off at a moment's notice to save the world. But for Sousuke Sagara, undercover high school student and member of the mercenary group Mithril, life in Tokyo seemed the same as always. But underneath the promising exterior spin the wheels of a conspiracy that threaten to destroy the peace. A new threat has arisen: Amalgam.

Sousuke and Kaname are back in action! And this time, the battleground is the school ground! High-yield explosives and hilarity come together with a bang!

Sousuke's in for the fight of his life! A simple art assignment turns deadly as the entire class gangs up on the mercenary-turned-model. Then, he has to defend Kaname against Yakuza thugs, battle karate masters, escape a chainsaw-wielding janitor, and rein in a super-creepy stalker.

Bring it on! Sport is war. At least, that's the attitude Sousuke takes when he and Kaname get enlisted to help Jindai High's flagging, pacifist rugby team. Against Kaname's will, Sousuke decides to bring the spineless squad up to speed with a little over-the-top, all-out-hilarious "basic training."

Sousuke and Kaname are back in action, and this time, the battleground is the school ground! High-yield explosives and hilarity come together with a bang, as the somber soldier and his unwitting target brave everything from lovesick "terrorists" to an unforgiving teacher who is bent on revenge.