Hikari and Noa are two mom friends who live in a luxury apartment and are married to celebrities. They are both sexually active and often talk about their sexual frustrations. Then they discover a secret party. It's a members-only event for the rich, and they wear masks to avoid revealing their true colors. They decide to attend, only to find a strange sight in front of them. This is their first introduction to the world of SM, and their first experience of masturbation at its most exciting...