Rin Hanei

Itsumi's kouhai from junior high school. She is a bully who will bring up Itsumi's black history and belittle her whenever she sees her. She has consistently rejected Itsumi's attempts to entice her to consume the love potion.

When it was revealed that Rin was a tsundere in love with Itsumi, her status was elevated to that of a cute junior.