Hidan no Aria  

Aria the Scarlet Ammo, 緋弾のアリア

Tokyo Butei High School is an institution where teenagers receive training to become "Butei," or combat detectives. One of its students, Touyama Kinji, has a unique ability that triggers when he's near girls and goes into "Hysteria Mode." Despite trying to keep it hidden, this mode makes him incredibly powerful and protective of women. On one occasion, Kinji is targeted by a Butei killer who sets his bicycle to explode. He is saved by Aria H. Kanzaki, an expert in assaults, but after witnessing his Hysteria Mode, she becomes fixated on him.

Hidan no Aria has been published in English as Aria the Scarlet Ammo by Digital Manga Publishing since April 29, 2014.