Reo works as a swimming instructor at a gym and has expanded into personal training. She is also dating Hashimoto, a former classmate who works at the same gym, leaving both her career and private life fulfilled. But Iida, a coworker who wanted her for himself, turns bitter and resentful. One day, while Hashimoto films a promotional video, Iida supports Reo in the pool and lets his hands roam far beyond what is necessary. It escalates into an assault inside the gym, forcing her to climax in an NTR ordeal.