Oki appears as a new coach in the athletics field of a private university. Oki was a demanding coach who imposed a harsh training method. Members were dissatisfied with such training, but had no choice but to comply. Meanwhile, Oki begins to care for and enthusiastically train Yui, who practices more than anyone else. and their relationship developed from there
![A happy practice session for a female swimming student](https://cdn-01.w3img.com/images_new/full_3_size/COl_5Z2gsIViQxkEJT6HtKpuSL3Yc7B0Ryo.jpg)