Reina, who had been living a peaceful life with her husband Koji in the house he inherited from his late parents. One day, Koji's younger brother Shigeru suddenly returned home. It turned out that he had lost his job and had come back to rely on Koji, his only relative. As they started living together, Shigeru began directing his sexual desires towards Reina. Confused but drawn into unfamiliar pleasures, Reina…
