An ambitious teenager is hired as a cook to prepare meals for geishas in Kyoto. However, she soon realises the intricacies involved in becoming an entertainer.
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.