●Aoki, a school teacher and swimming club advisor, is aggressively pursued by his student Yuki, who quit swimming due to injury, and gradually the two end up in a physical relationship. Aoki is engaged to her colleague Kagawa, but she is unable to end her relationship with Yuki. Every time Yuki ejaculates inside her, an unknown pleasure hits her, and her beautiful, well-trained body gradually begins to move away from her fiance...