The main character, Hirotaka Katagiri, married his wife, Aiina Katagiri, eight years ago when she was only 20 years old. But now that Hirotaka is in his forties, he is shocked to find that his strength and vigor have declined. I consulted a doctor and he said the cause was psychological and recommended that I get stimulation to counteract the rut. However, he and his wife tried many things, including watching porn, but it didn't solve the problem.

One day, he meets his former subordinate, Shoji Soma, whom he took care of in the past, and they hit it off. Then he hears that after he lost his wife, he participates in a sexual act with a certain couple and relieves his sexual desire by playing cuckold. It is surprised that a familiar acquaintance was doing such an act which had no connection at all, but he shows interest and when watching the cuckold porn which he had not seen before with my wife, he is surrounded by a strange excitement.

His interest in the realistic act gradually grows, and in order to get sexual stimulation, he asks her to take part in a pseudo cuckold play with Aiina. The pseudo act was only a caress, but it succeeded in causing excitement and the sexual act of the couple becomes very exciting. Later, he wanted more stimulation and with his wife's consent, he would request more intimate sexual acts. It was out of trust in Shouji and he responded to it - but...