Female swimming club advisor Aoki Momo can't bring herself to marry her fiancé (colleague) because she feels too much pleasure getting creampied by a student who intentionally repeated a grade just to stay with her
Aoki Momo, a school teacher and swimming club advisor, gradually finds herself giving in physically to her former student Yuuki, who had to retire from swimming due to injury. Yuuki aggressively pursues Aoki, introducing her to new forms of pleasure. Though Aoki is engaged to her colleague Kagawa, she cannot end her affair with Yuuki, and her heart and body slowly drift away from her fiancé. Each time Yuuki fills her with his creampie, unknown waves of pleasure overwhelm Aoki, enhancing her physical beauty and desire. As her bond with Kagawa weakens, Aoki becomes increasingly consumed by her relationship with Yuuki.