Sugai, Hinata

為我井陽

She embodies the Naraka Realm (Hell Realm) and is constantly accompanied by a small fire-spitting demon pet. This pet transforms into a full-sized demon when Hinata is unable to suppress her Naraka bosatsu. Later in the series, as Ikkou approaches awakening, she frequently orders her demon to burn him. This action often successfully prevents his awakening, though at other times it appears to be done simply for the hell of it. She is Sakura's younger sister. She appears very calm and rarely speaks. Her hobby is collecting and studying haniwa. The second season features an episode dedicated to the Haniwa Research Club, which she joins; it is the school's smallest club.
[wikipedia]