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.
The story is set in Abashiri, Hokkaido, and follows a high school student, Nagi, who transferred from Osaka.
Tsukasa Kobayashi has the appearance and educational background of an elite and earns a good salary, but he is actually incompetent at his job and makes mistakes frequently, earning the ire of his co-workers. Tsukasa was about to quit his job after much humiliation at work when he learns that his wife is pregnant.