Clair Aoki

Claire Aoki (青木紅愛, Aoki Kurea) is a young girl who is looking for her sister, which became a monster. After meeting Shuichi Kagaya, who was also a monster, she teamed up with him in order to help her find her.

Plot
Claire wanted to end her life and started an arson, but was saved by Shuichi Kagaya. While being saved, she woke up and saw him looking as a monster.

On the next day, she found Shuichi in school, showing him his phone and telling him she saw him and that she is interested in monsters like him and wishes to talk. As they met on the roof and Shuichi told her he wasn't a monster, she pushed him down from roof. While falling he transformed and then jumped back on the roof. She then started questioning him what was he and threatening she will reveal his secret. But Shuichi had no idea, and told her, he just transformed one day. On the way to her home, she introduced herself and showed him a coin she found, but Shuichi didn't know anything about it. In her apartment, she explained she was looking for her sister, who was a monster like him.