Nise Hyoudou is a minor character appearing in the prologue chapters of the upcoming story, High School DxD: Infernal Horizon, but later becomes the primary protagonist alongside the cast of the Occult Research Club. Nise is the younger adopted brother of Issei Hyoudou, having been taken off the streets by Issei's parents, he was raised by them for two years before the events of the Great Blaze. After the cataclysmic event, Nise was separated from his elder sibling, and has been searching for him ever since.