Ritsuko Kawai lost her husband and lives alone with her son. As her son grows older, she finds herself lonely, longing for affection despite her reserved nature. One day, her son's friend comes to visit, and she ends up playing the role of a mother figure for the day. While cleaning his room, their relationship gradually turns intimate. Though she feels guilty, believing herself a failure as a mother, she cannot suppress her inner desires. Wrapped in his warmth, her body awakens, overwhelmed by emotions she can no longer control. A bittersweet, deeply seductive story of a woman torn between heart and body.