Rihito and Arisa are a new couple, studying together at Arisa's house. Arisa's mother, Yurika, is kind, beautiful, and wears clothes that accentuate her breasts. Even though he knows she's Arisa's mother, Rihito can't help but get excited. While Rihito is in the bathroom, he accidentally catches Yurika having a wild solo session. She's moaning his name while pleasuring herself, pretending to be Arisa. Watching Yurika's solo act, Rihito's own erection grows, but he can't quite finish. He returns to the room feeling restless, but all he can think about is Yurika.
