Reika is a beautiful wife who is well-known in the neighborhood. Her faithful devotion to her husband makes her neighbor Koichi's Kokoro pound. One day, Koichi injures both arms in an accident and is invited to her house to complete the procedures with the insurance company that Reika introduced to him. He heads to the house with excitement, but what he sees there is Reika straddling a man and shaking her hips violently. Koichi leaves in a hurry, as he is shocked by the lewd behavior that is unimaginable from her usual cheerful appearance, but later, Reika invites him to dinner...