Inase Rebecca

A student under the protagonist's class, and the organizer of the Sex Research Club. A Japanese-American citizen born from a Japanese father and American mother. Inherited the blond hair and blue eyes from her mother.

She's arrogant, haughty, and a pervert. Using her status as the prized granddaughter of the school principal, she looks down on everyone including her teachers.

Inherited her mother's high sexual drive, and is basically a sadist type. Uninhibited and greedy when it comes to sexual pleasures. She established the Sex Research Club due to her parents having a low sexual affinity towards each other, which led to their divorce. Leads a daily sexual life to find the ideal partner (dick). She boasts a high level sex technique born from a deep experience, enough to put sex industry workers to shame.

Interested with the protagonist who also divorced due to the same reason as her parents.