While focusing on exam preparation, Sho struggles to maintain concentration and quickly finds his mind wandering. As he continues studying, he drifts into lewd fantasies. His inner turmoil deepens when his mother's close friend, Yumiko, visits their home. Captivated by Yumiko's voluptuous figure, Sho can't resist locking himself in his room to masturbate. But just then, Yumiko suddenly appears, pushing his emotions into even greater chaos.