Read Killer in Love manga at Bonmanga
Summary: Suzuki Ryuto 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 over his virginity. One day he comes to a drinking party where he meets a beautiful girl, Kokoa. Per her request, he pretends to be her boyfriend to ward off the stalker who has been harassing the girl. Their tender love lead to great tragedy.
Other names Kimi ni Koisuru Satsujinki / Kimi ni Koi Suru Satsujin-ki / The Killer Who Loves You / きみに恋する殺人鬼