Kenji is a motorcycle enthusiast who loves nothing more than riding. One Wednesday he takes his girlfriend Tomomi on a tour of Hakone pass and finds riders waiting by the road. One of them, Hayase Junichi, tells him about a legendary female driver called Wednesday's Cinderella, who passes through every Wednesday in a white Porsche said to be possessed by a devil. Riders come each week to race her, and none of them has ever won. Kenji takes it as a challenge and asks a bike shop owner to tune his bike for fun. The owner, troubled by his own past, refuses at first but gives in, hoping a win by Kenji could heal the driver's trauma. Racing her soon proves more dangerous than it first seems.