Hikari and Noa are two mom friends who live in a luxury apartment and are married to famous people. They both have extremely strong sexual desires and are constantly talking about their sexual frustrations. Then they find out about a secret party. It's a members-only event for the wealthy, and they wear masks so their faces won't be revealed. They decide to attend, only to find a strange sight unfolding before their eyes. It's their first glimpse into the world of SM and their first experience of the most amazing masturbation...