Mika, the protagonist, is a mature woman who owns a women-only rental apartment building. After losing her husband, she lives alone with her reclusive son, who has a habit of peeping. Despite this, Mika struggles with an abnormally strong sex drive. She finds herself aroused while helping her son masturbate, gradually developing an intense obsession with his body, leading their relationship into deeper, forbidden territory. This highly sexual work portrays Mika as a sensual, lustful milf, deeply immersed in taboo desire.