Asasaka Meguri

Tokiya's younger sister. She is a first year student and a close friend of Aoba. She has a strict, yet gentle personality. Due to their parents rarely ever home, she has always been alone together with Tokiya and taking care of him, making her somewhat a brocon.

When Tokiya asks her to help him win the girl he loves, she uses Kokai no Gi to get the girl fall in love with him. In her route, It works on herself by mistake.

Spoiler

It's revealed in the end of her route that Kokkai no Gi was created by a pair of siblings who fell in love with each others, but fate prevented them to be 'united' and accepted by society. Meguri is the reincarnation of the sister.