The woman he had an affair with was his sister-in-law, his wife's older sister. He got married in his youth. He got married on impulse, but their fights increased and their relationship became monotonous. As the marriage entered a slump, he began to feel disgusted and his days became dull. It wasn't long before he started an affair with his sister-in-law, Mayuki, who had been giving him advice. A sleazy affair with no end in sight, but he couldn't stop this urge. He indulged in passionate sex that reminded him of the feeling of "love" that he had almost lost in his married life... and he creampied her again and again.