陽キャグループの底辺に属する、気弱な大学生・鈴木龍斗。
キツめの童貞いじりに傷つきつつも、ノリが悪いヤツと思われないよう、乾いた愛想笑いが得意になっていくだけの日々を送っていた。
ある日の新歓コンパで、龍斗は同級生の美少女・心愛と仲良くなる。
ストーカー被害にあっている心愛を助けるため、龍斗は心愛の彼氏のフリをすることに。
その小さな恋心が、惨劇の始まりだった ー
Here's the synopsis in Japanese. It says nothing about yakuza group idk how Google translate got that lol. Basically it says "he was the bottom feeder in the group of extroverts and he spent his days trying to fit in. One day he meets a beautiful girl called kokoa during a welcome party for new students and befriends her. After hearing that she is being stalked, he decided to pretend to be her boyfriend. That was the start of a tragic story... " very rough translation but it's pretty much what happened in the first chapter