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Aoki, a school teacher and swimming club advisor, is being pursued by Yuki, a student who quit the sport due to an injury, and they gradually become involved in a physical relationship. Aoki has a fiancée, Kagawa, who is a colleague, but he is unable to end his relationship with Yuki. Every time Yuki's semen is discharged inside her, Aoki feels an unknown pleasure, and her beautiful, well-trained body is slowly being separated from her fiancé...