With graduation 10 days away, homeroom teacher Hiiragi gathered all 29 students of class 3-A and proclaims them his hostages. His last lesson regards the death of a student that passed away a few months before. Nobody will be able to graduate until the truth is known.

Minare Koda, a floor manager at a small restaurant in Sapporo, tries to deal with her bad breakup with an ex-boyfriend. In the process, she drunkenly vents her frustrations to an older man sitting next to her at a local bar. The following day, she discovers that the man works as a producer at a nearby radio station, which broadcast her drunken ramblings over the airwaves.

As Minare's voice gains her more attention than her work at the restaurant, she ends up becoming a late-night radio talk show host at the same station, trying to balance her talk show with her daytime life to make ends meet.