One day, his wife suddenly ran away from home! Koichi was at a loss as to what to do when his mother-in-law came to help him with the housework out of concern for him. Koichi was grateful, but he was shocked by an unbelievable sight. His mother-in-law was wandering around naked in front of him after a bath. Koichi was overwhelmed by her sexy, curvaceous body. He tried to avert his eyes and endure, but his body reacted obediently, and evil thoughts began to form in his mind...