Yusuke graduated from a university in Tokyo and got a job there, so he went on a three-day, two-night trip to a hot spring with his parents to show his gratitude. Ever since he was a child, Yusuke had thought of his mother, Yurie, as a woman, but he could no longer contain his emotions and, sneaking around his father's eyes, forced himself on Yurie. Yusuke's Kokoro was torn between a sense of accomplishment and guilt...he knew it was wrong, but his Kokoro and body ran wild...