START-498 | The man who had sex with her best friend's husband at a sex club. One woman wants to dominate the other, and the other wants to be dominated... Two opposite married women succumb to pleasure and end up engaging in a foursome swapping session. Hikari Aozora, Rei Kamiki

Hikari and Uruha, two best friends, are worried about their compatibility in the nighttime with their husbands. After discussing it, the two couples decide to visit a happening bar. Inside the bar, where a "Masked Party" event is being held, they are swept up in the stimulating atmosphere... and beneath the masks, Hikari and Uruha's desire to dominate and be dominated explodes. However, the people they are facing are each other's husbands...