Utou Suwana

Shuuichi and Chizuru's cousin, she gets her blond hair and blue eyes from her mother. She also attends the same private all-girls school as Chizuru and has better grades than Chizuru.
While Suwana has not done it yet, she is knowledgeable about anal sex due to watching western porn. She is even aware of it being done in Japan as a form of contraception.
She is more bold than Chizuru but still gets embarrassed all the same.