Kinoshita Maki

Physique: Huge breasts and a curvy figure of a western porn star.
Hobbies: Teasing her chaste students, drinking.
Skills: Turning anything into a dirty joke, giving blowjobs (self-proclaimed.)
Weaknesses: Working seriously.

She is a teacher at the protagonist's school and Jun's older sister. She is next-door neighbors with the protagonist.

An elite from a top university who has returned from Tokyo... and yet, she's actually quite a weirdo. Anyway, she seems to enjoy telling sexually charged dirty jokes to her students, almost as if she has an automatic "ero-speak translation function" attached to her. She can turn even a nonchalant everyday conversation into a dirty joke.

Rumor has it she never wears panties under her miniskirt, but no one has yet to confirm this.