Due to her husband's infidelity, the mother of Satoshi's friend Yuri left home after a fight and is now staying at their place for a while. Despite being his mother's classmate, Yuri has an alluring and sexy figure that excites Satoshi, making his heart race... Unable to contain his curiosity about Yuri, Satoshi peeks at her naked body as she changes in the bathroom. Back in his room, Satoshi can't help but masturbate thinking about Yuri's voluptuous figure, but to his surprise, he is caught by Yuri...
