Junkichi and his wife's mother, Chisato, lived happily together. One weekend, while his wife, Minami, was away at a friend's wedding, Junkichi, under the influence of alcohol, confessed to Chisato that he had been interested in her ever since they first met because she looked like his first love. Junkichi approached Chisato almost forcibly, but Chisato, who had lost her husband a long time ago, was unable to refuse and ended up accepting her offer.