Kimi ni Koisuru Satsujinki

Suzuki Ryuuto is an introverted, timid college student. Every day he puts on a fake smile, trying his best to blend into a group of outgoing students even despite cruel teasing about his virginity. But one day, he comes to a drinking party where he meets a beautiful girl, Kokoa. Per her request, he starts to pretend to be her boyfriend to ward off the stalker who is harassing Kokoa. That tender love was the beginning of a tragedy