Naisho No — Kan-in -manatsu No Asedaku Koubi-

A year into his isolation, his three sons—concerned about their father’s deteriorating mental and physical health—decide to intervene. They each send their own wives to the countryside to care for him. What begins as a mission of familial devotion soon devolves into a series of complicated and "secret" sexual encounters as the heat of midsummer and the proximity of the living arrangements break down social barriers.

Initially cold toward Kenzo, she views him as lecherous and crass. However, she harbors a hidden submissive side that is eventually brought to the surface.

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A cheerful, half-Japanese woman who is aggressive and open-minded regarding her sexuality. She views her marriage as flexible and doesn't harbor traditional views on infidelity.