Himena Tsukimiya

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.

A human member of a defense force is given the life and ability to change into a giant super-hero to battle the monsters that wreaks havoc on Earth.