Iwatani Sana

Personality: 

A brash gyaru who constantly tries to keep up socially, always trying to keep everyone around her happy and helping them. The world revolves around her, in that if anything goes wrong it's all her fault. Unusually casual attitude - the hyperviolence she's exposed to upon associating with Nozomu is just kind of like... gross. Has never panicked a day in her life.

Story:

Guilt has led her to be sensitive to Nozomu's presence, so when he began acting suspiciously, she was the first to notice. No matter how much she wants to leave their past behind her, she can't help investigating, and her bizarrely casual feelings about Nozomu's disposition towards violence has endeared Nozomu immediately.

Background:

Nozomu's childhood friend in elementary school. Was diligent in the efforts to find him when he went missing, but when he came back, she found his personality so disturbing she distanced herself. Their friendship was swept away when they went to different middle schools, but she remained haunted by guilt at abandoning him when he needed her the most.