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...

It's the day of the cultural festival. The final event of the day, the confession festival, will decide everything... Sueharu spends the day nervous as well as busy with his class's exhibit. Will the confession festival plan work out? Then a visitor comes to see Sueharu, and he realizes he's been carrying on with a massive misunderstanding. The cultural festival winds down, and with the confession festival soon to begin, Kuroha makes an unexpected move.

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...

At the end of the Okinawa trip, Sueharu was injured catching Shirokusa in a fall. So Shirokusa decides to stay at his house for a while to care for him, pleased with the chance to get ahead of the other two girls. But Shion, the maid accompanying Shirokusa, has harsh words for Sueharu with regard to his half-hearted attitude toward everyone. The next day, Maria starts attending their school, creating a harem around Sueharu that earns him the contempt of all the other boys.

Shirokusa and Kuroha have agreed to appear in the drama for the true ending that's set to be released at the same time as the documentary. Kuroha, the last to interview Sueharu, looks back on her memories with him. She was there before he became an actor, the moment he became a star, and after he left show business, watching from right by his side. The place she's chosen to bring him for the interview is their "secret base," the place where they opened up to each other long ago.