Kikunaga Ruri

Ruri is a girl that used to know Kouji before he moved to Florias. She's always looked up to him as an older brother, and presents herself as a timid girl. Of course, Ruri has a much darker side that at first only manifests when she and Kouji are alone. Simply put, Ruri is the "master" and Kouji is the "slave" in their brother-sister relationship. In fact, Kouji developed a deep fear of her back when they were children.

Ruri decides to track down our protagonist to renew their "relationship" by trying to blackmail him into going to the same university as her. At the same time, she aims to get away from her mother, who has remarried for the sixth time.

Despite her faults, Ruri yearns for nothing more than to have a place in the world. She's convinced that she's the only one that truly cares for Kouji, but finds herself at ease with the other characters.