『Fuu Inubouzaki』

A third-year in middle school and the president of the Hero Club. She is the older sister of Itsuki, who she has been looking after following the death of their parents. She is knowledgeable about Shinju and the Vertex and was the one who gave her fellow members the app needed to fight against the Vertex. She uses a large sword in her hero form and her familiar is Inugami(犬神). Later she gets another familiar named Kamaitachi(鎌鼬). As a result of using her Mankai form, she loses vision in her left eye, but regains it back after the events of the final episode. It is also revealed that her parents were killed by Vertex, and as such her original motivation for fighting Vertex was for revenge. Details about the exact situation of her parents' death were not given.