He specializes in video games, but he also reads a lot of manga and watches a lot of anime. (He likes all kinds of games, but he's especially fond of FPS games, fighting games and action games, where it's not necessary to level up.) He goes for one person in video games and finds everything from visuals to status as being important. He prefers e-mail for communication as the tension isn't as high as it is otherwise. Hirotaka is also better at showing his feelings when he types from the help of emoticons.

Shinra is a Fire Officer Second Class and a Third Generation Ability User belonging to the 8th Special Fire Brigade. His ability permits him to emit flames from his feet. Twelve years before the start of the series he was held responsible for a fire accident in which his mother and younger brother was killed. He is often shown with an artificial and menacing-looking grin on his face. Because of this and his history, he acquired the epithet "Devil." His dream is to become a hero who protects everyone.