A brief description of the manga The Killer Who Loves You:
Suzuki Ryuuto is an introverted and weak-tempered student. Despite the constant taunts about his virginity, day after day he fakes a fake smile in an attempt to blend in with a group of outgoing students.
But one day he comes to a party where he meets a beautiful girl named Cocoa. At the request of the girl, he begins to pretend to be her boyfriend in order to drive away the stalker. This little love was the beginning of the tragedy…