Koharu Nanase

Brotherly term of endearment: "Onii" Hiyori’s older twin sister. Among her siblings she’s the most energetic. With few worries, when something crosses her mind, she’s a girl that blurts it out without any hesitation. She’s open-minded about sex and is a type that is frank and okay with dirty jokes and indecent topics. When her parents are away, she boldly tempts her older brother with sexual advances. It’s an established fact that she always outmaneuvers the others. Multi-skilled, she participates in both the tennis and swimming clubs. Due to that, she always eats a lot, but unfortunately none of those nutrients go into her chest.