Hiiragi Hinase

Tsubaki's loner, short-tempered twin sister. She went to a different school than her sister just to get away with her. She initially talked to no one in her class until Utsugi Ren forces her way into her life. Before Ren showed up the only person in school she talked to was the school nurse, Akutami-Sensei, much to the nurse's dismay.