Anji Kuroki is a character who is recruited by Kaname Joji to become a member of the Flamengers, a team formed to support the activities of Masayoshi Hazama. He joins the group as Flamen Black, designated as the fifth member of the team, and takes on the specialized role of the weapons specialist. At twenty-four years old, Anji is a young adult who, in his spare time, dedicates himself to farming and caring for his sickly grandfather. This background establishes him as a character with a strong sense of responsibility and a connection to a quiet, rural life outside of his heroic duties.

In the narrative, Anji serves as a teammate to the central hero Masayoshi Hazama, as well as to fellow Flamengers Sakura Momoi, Souichi Aoshima, and Hekiru Midorikawa. He is a follower of Joji Kaname, the individual who assembled the Flamengers. A significant antagonistic force in his personal story is Haiji Sawada, who attacks Anji's grandfather in an attempt to agitate Masayoshi Hazama, creating a direct and personal conflict for Anji. Physically, Anji is characterized by gray eyes and purple hair that is cut to ear length, and his appearance is that of a male teen.