Marina, a married woman, lives with her son and her son's friend, Osawa, while her husband is away on business. Osawa secretly admires Marina and becomes increasingly drawn to her as he watches her doing housework. Having had no physical contact with a man for a long time, Marina is startled by the sudden advances yet finds her emotions stirred. As unsettling sex unfolds right beside her son, the family's privacy collapses. Soon another friend joins, escalating the situation into an intense threesome. Amidst the sudden upheaval in her daily life, Marina is forced to confront her own feelings and the reality of the situation.