立石 まゆり

Souji's little sister. She quickly picks up rumors, has good social skills and is very informed on stuff. Mayuri calls her older brother "anii". She loves Souji for his kindness, but that's ultimately familial love and not a romance one. Still, she declares that "if I'm to go out with someone, I'd like someone who's like anii".

A sweets lover, her favorite food are crepes with topped with lots of cream, especially Hayane's handmade first class ones.

A sexual-harassing devil who rubs heroines' boobs and then goes "jealous, aren't you~" to her brother.

Quite the clutz, immediately relies on Souji when in trouble, behaves spoiled. She also tries to do everything possible to put her brother in a romantic relationship with the girl he likes the most.