Hidan no Aria

In the prestigious Tokyo Butei High School, a special institution that trains armed detectives, or "Butei," students hone their skills to excel in their chosen field. Tohyama Kinji, a sophomore student, possesses a unique body that undergoes a transformative "super mode" when stimulated by specific triggers. Desiring a peaceful life, he attempts to conceal this ability from his peers. However, his plans are disrupted when he becomes the target of a bombing incident, and he crosses paths with the elite of the Butei High "Assault" department, Aria H. Kanzaki.