In the winter of his first year in high school, Maru Sueharu fell in love with Kachi Shirokusa, a genius novelist who happens to be his classmate. But since it was his first love, time only continued to pass by while he could do nothing. As his so-called friend Tetsuhiko chides him and his childhood friend Shida Kuroha teases him, he overhears his crush Shirokusa saying she has a boyfriend now. His heart broken before he could even confess his feelings, Sueharu is devastated. Then Kuroha proposes that they get revenge...

Sueharu tries to dig up some bad rumors about Shirokusa's boyfriend Abe-senpai that he can use to get revenge, but it turns out Abe-senpai has been looking for Sueharu all along and knows his secret. Sueharu's desire for revenge grows even stronger when Abe-senpai reveals why he started dating Shirokusa. He decides to use his class's play production at the upcoming cultural festival as a chance to get back at him, and asks Shirokusa to write the script...

Sueharu thought he had carried out his plan to perfection at the confession festival, but what he thought was just a little idea of his own ended up involving everyone around him, and when he confessed to Kuroha, she rejected him. Kuroha answered his feelings with a hard no, and Shirokusa had to hear him say that he "was" in love with her, but no longer is. And now, a newcomer is about to make this love triangle even more complicated...