Hikari and Noa are close friends and mothers who live in luxury apartments, each married to a prominent public figure. Both have overwhelming sex drives and constantly talk about their frustration. Then they hear about a secret members-only party for the wealthy where everyone wears masks, allowing them to join without revealing their faces. What awaits is a shocking world of BDSM unlike anything they have seen before. Restrained and subjected to all kinds of sexual play, they discover intense masochistic pleasure and learn just how good surrender can feel. A new door has only just opened for them.