For the past five years, her husband has been frequently away on business trips, leaving her to live alone with her son, Kota. She used to work in the esthetics industry, but became a full-time housewife after her husband began traveling. Over time, loneliness crept into her life, leaving emotional gaps that grew harder to ignore. Kota, her son, had always been affectionate, often telling her, "It's my turn to give you an oil massage now," referring to the massages she used to give him. But those innocent words gradually took on a different tone, his once-childish touches evolving into something more mature and sensual. Slowly, she begins to notice the change in him—and in their relationship.