A comedy focusing on Kondo Asami, a 33-year-old single woman who lives with her parents and works at the local city hall, and suddenly finds herself starting her life over from scratch.
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.
Three unlikely thieves break into a mansion looking for the cash they believe its owner is hiding, only to encounter unexpected complications.
