Kinji is a junior at a high school for mercenaries. He just wants to be normal, but his secret condition—he turns into an ace killer when he's turned on by the female form—triggers a fiery transfer student's unrelenting desire to make him her partner.

[Source: FUNimation]

The story takes place in Tokyo Butei High School, a special school where armed detectives—"Butei"—are trained to use weapons. Kinji Tooyama is a second-year-student who has a special ability, but he keeps it a secret to maintain an ordinary, peaceful life; however, when he gets caught in a bombing on the way to school, he encounters H. Aria Kanzaki, the most powerful S-Rank Butei student in Assault Studies.

[Source: Anime News Network]

The story revolves around Akari Mamiya, a first-year E-rank student at Tokyo Butei High School who aims to become a Butei and idolizes her S-rank upperclassman Aria H. Kanzaki. The high school has an "Amica" system where one upperclassman is paired with one underclassmen for training, and the story follows Akari as she strives to get Aria to become her Amica.

[Source: Anime News Network]