The son is active as a young member of a certain group, but one day he is suddenly ordered by his superiors to avenge his uncle's enemy, who was attacked by a rival organization. He was just about to report this order to a senior officer when the incident occurred. Unaware of these events, his mother, Reiko, who had been looking forward to visiting her husband's grave together with her son, happened to be present at the scene. The son treasured the time he spent with his mother at the inn he had arranged. There, seeing his mother relaxing in the indoor bath, he found himself captivated by her appearance. Having never been with a woman before, the son felt intense arousal. As the appointed time drew near, overwhelmed by uncontrollable desire, he approached his sleeping mother.