10 days away from graduation, homeroom teacher Hiiragi, stands in front of his students and tells them they have now become his hostages. He says that no one can leave unless someone can tell him the reason behind a past student's suicide.

With her gloomy demeanor, Sawako has a hard time fitting in. But when an outgoing classmate approaches her, life takes a turn for the better.

After a painful breakup with her unfaithful coworker boyfriend, Maika teams up with her company’s new CEO, Shun, in a fake relationship to get revenge. With Shun looking to dodge an arranged engagement, their plan works for both—until hidden motives surface, sparking a deeper web of love, lies, and revenge.

Takagi, now grown up, revisits her middle school as a trainer. She encounters Nishikata, her former classmate she used to tease, now a PE teacher there. Their playful dynamic resumes, leading to more interactions between the two.

A former child star, working under a false name, is tasked with managing a team of troubled talents in a struggling department, all while hiding her past and facing a tough boss.