Katagiri Rieko

Older, married public health doctor. Her married life with her husband has become dull and is she is getting more and more frustrated by the day.

She has a hobby of mixing various kinds of medicines and wants to develop her own medicines with strange effects.

She has a bombastically ripe and mature body, and her breasts are the biggest in the school. They're larger than Maiko's.

She is considered the most beautiful woman in the school. She liked Yuuki at first sight and seduces him every time they meet.