All participants are adults. Four years into marriage, Sora remains childless because she and her husband are sexually incompatible. Behind her faithful-wife image lies a twisted kink she could never confess to her serious husband: crossing the line with strangers in places where sex is forbidden. She keeps the urge suppressed until she witnesses another couple living out that fantasy and her restraint finally snaps. On her way home from shopping, she spots a cute adult man heading toward the smoking area and follows him.