Azalea has been residing on the Colony-Planet of Dinahl, and she can't recall anything about herself until she hears a voice calling her name. Then there is another voice summoning her to go to a park on top of a skyscraper. Once she arrives there, she meets up with other people who also have no recollection of who they are or what they were doing before arriving at this destination as instructed ...

Saki Asamiya is given a chance to delay her mother's execution by working as an undercover cop and infiltrating Takanoha High School to investigate some mysterious deaths among the student body. Once there, she comes face-to-face with the powerful Mizuchi sisters, who moved in and have taken control after her previous expulsion.