For 4 years, the student had sex with the teacher of the athletics club

Oki appears as a new coach in the track and field club of a private university. Oki is a youkai trainer who imposes a strict training regimen. The members had no choice but to obey such a large tree, even though they were not satisfied with it. Meanwhile, Oki is passionate about teaching Yui, who is more enthusiastic and practiced than anyone else. The trusting relationship between the two eventually develops into a romantic relationship. While aiming for national domination, while specially training with a three-legged race