Rieko, a mother, is invited by her son to go on a hot spring trip. It's something she hasn't experienced since marrying her husband, who is devoted to his work, so she couldn't help but feel excited. They arrive at a nice-looking inn and head straight for the hot springs. Rieko is enjoying the open-air bath in the refreshing sunlight. Meanwhile, her son thinks of Rieko as more than just a mother, and he's planning to confess his secret feelings to her on this trip. At dinner, the mother is in high spirits after enjoying the inn's food and drinks. Her son can't resist the sight of his mother's body peeking out from under her yukata hem, and he attacks her. Her son is overcome with self-loathing. Rieko is in a daze for a while. After a while, she spots her lonely-looking son and returns to her room. Rieko gazes at her son's profile, but when her eyes meet his, she apologizes, embraces him, and kisses him...