Shiho who married her husband Takeshi and lived with her father-in-law Mitsuru. Mitsuru warmly welcomes Shiho, saying that the all-male household has blossomed. One day, Shiho, who is extremely short-sighted, accidentally breaks his glasses. Immediately after that, Shiho, who was drawn to the bathroom by a noise that she heard from somewhere, thought that her husband was taking a bath, and took off her clothes, but she was there. Mitsuru couldn't hide his surprise at the sudden event, but from that day on, he pretended to be her husband and began to play with Shiho's body.