Mother Ritsuko (47) and son Ken (20) – a secret record of love within the household. After Ken discovered masturbation, he began stealing his mother's underwear to climax, gradually developing a growing interest in her. Once, he was caught by his mother, who firmly told him, "Masturbation isn't bad—everyone does it. Even I do it sometimes, you know that, right? But stop using my underwear. And Ken, you'll find someone better than your mother." At the time, Ken apologized, saying he'd never do it again—but soon found himself aroused by his mother once more. Eventually, the two became intimate. Ken felt a deep sense of crisis, questioning himself: "Will I become a man who can only have sex with my mother?" It was his mother who reassured him, saying, "It's not normal, but it's not abnormal either," and suggested they submit their story. Ken admits the idea of submitting was terrifying. For some reason, Ken always felt uneasy around his father, and since childhood had deeply loved his mother—up to puberty, he genuinely wished to marry her. During the time he was withdrawn from school and unable to fit in, his mother was the only one who stood by him. She was the center of his world, and moments alone with her brought him the greatest comfort. When he clung to her in the bath, suckling her breasts, Ken forgot all his troubles and was wrapped in pure happiness.