High school students Takeshi and F1 were working part-time to earn money by stealing mopeds and selling them to delinquents. One day, Ayaka, who has transferred to the school Takeshi attends, joins them, and the three of them decide to steal a moped. When he tries to steal a moped parked in his apartment, he is found by a woman wearing a mask who seems to be the owner. Takeshi and his friends escape on a motorcycle, but they are quickly overtaken by a running woman with unbelievable physical abilities. This masked woman was a slit-mouthed woman who ran 100m in 6 seconds with her mouth split all the way to her cheeks.

Momi’s House is a facility to support self-reliance of young people with problems. The facility is run by Yasutoshi (Naoto Ogata) and his wife Megumi (Misato Tanaka). Ayaka (Sara Minami) is a 16-year-old girl. She has refused to go to school for about half a year. Her mother decides to send her to Momi’s House. While staying there, Ayaka begins to change.