During her school days, Kyoko Ohashi, who had made a name for herself nationwide in swimming competitions, returned to her alma mater, Aotaka Academy, as a swimming coach. Once a prestigious swimming club, it was now on the verge of collapse, and Kyoko was invited back to turn things around. However, students Hisamichi and Hashimoto plotted a rebellion against Kyoko's passionate guidance. They lured Kyoko to the gym storage, knocked her unconscious, and then toyed with her body.
