The Kurokawa couple who live nearby are Kayama's ideal partner. Meanwhile, Kayama is living alone after his wife ran away. However, when he happens to visit a soapland, it is Kurokawa's wife, Sumire, who greets him with hands folded. While she is confused, Kayama is excited and makes her take his cock in her mouth, saying, "I'll keep it a secret!!" From that day on, Kayama becomes a regular customer, and Sumire is confused by him, but her days continue to be taught the joys of being a woman by Kayama's huge cock. However, one day Kayama visits the store...