A dilapidated four-and-a-half tatami mat apartment where the wind blows through the Kanda River. A married woman's heart is enveloped in pleasure as she discovers a new kind of love. The story of an elementary school teacher taking the mother of his student. Yuu (31), mother of an 11-year-old son, visits her child's homeroom teacher (a single middle-aged man) at his rundown apartment to request a recommendation letter. She believes a mother's passion can decide everything. By surrendering her body, the sexually frustrated housewife succumbs to the intense, skillful touch of a mature man, her arousal dripping endlessly. Her experienced, post-childbirth pussy convulses in repeated orgasms, refusing to let go of his cock. Here unfolds a secret affair filled with desires she can never confess to her husband or son.