Yuuki Wakura

A high school graduate, Yuuki was embroiled in a Mato Mishap, and was rescued by the 7th Squad of the Demon Defense Force led by Kyouka Uzen. After aiding the latter in defeating a horde of Shuuki, Kyouka invites him to work for the DDF under her command. Wishing to become a hero and to avenge his older sister, who disappeared in a similar incident, Yuuki accepts the offer. He currently works as a full-time dormitory caretaker for the DDF's 7th Unit, and also serves as Kyouka's combat slave on DDF missions.