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Maki is a married woman whose husband is posted overseas and lives with her son. One day, her son, a university student, brings his friends over to the house to help him write a report on his homework. Late at night, one of his friends witnesses Maki masturbating in the bedroom, and using her obscene behavior as an excuse to approach and rape her. Even as she is being raped, her body responds to a long-forgotten pleasure, and she becomes intoxicated by the orgasm that comes her way, drowning in ecstasy.