Rieko was excited as she headed to a hot spring resort, invited by her son for the first time in a while. Her marriage to a work-obsessed husband rarely allowed them to spend time together, so she looked forward to enjoying this rare family moment. Upon arriving at the inn, they immediately headed to the hot springs. Under the pleasant sunlight, Rieko relaxed in the outdoor bath, visibly at ease. Meanwhile, her son harbored secret feelings for her and had planned to confess during this trip. After dinner, warmed by food and alcohol, Rieko grew flushed and sensual, her body partially visible beneath her yukata. Unable to resist, her son suddenly made a move on her. Overcome with guilt afterward, he fell into self-loathing, while Rieko stood frozen in silence. Later, noticing her son looking lonely, she returned to the room and gazed at his profile. But when their eyes met, Rieko whispered, "I'm sorry," pulled him close, and kissed him passionately.