Tokaku is a distant and cold girl. Even at first glance, she has the appearance of an assassin.She eventually grows to care for Haru in time, even coming to the point of calling herself Haru's protector. Azuma dislikes it when other people try to get close to her, and she especially hates being called by her first name, but Haru compromises and calls her "Tokaku-san". She is skilled with using knives, and has exceptionally quick reflexes. It is soon revealed that Azuma has never killed anyone before, despite possessing very useful skills as an assassin.