oki appears as a new coach for the track and field club of a certain private university. oki was a demon coach who imposes strict training. the club members had no choice but to obey such a large tree, even though they were dissatisfied. meanwhile, oki is enthusiastic about teaching yui, who practices more than anyone else. the relationship of trust between the two eventually develops into a romantic relationship. aiming for national domination, while doing special training with a three-legged team ….
