Shinonome Rio

Aoi's sister and one of the counselors on the island. Her job is to help boys and girls have sex often and make sure they follow the rules. Every day she plans out games for the girls and boys to participate in such as public confessions, lovemaking contests, and endurance competitions to see who can last longest before climaxing.

She'll have sex with anyone who asks anywhere but she especially enjoys sex with Itsuki and her own sister Aoi.