Ako Amau is a 17-year-old student and the senior administrator of the Gehenna Academy Disciplinary Committee, effectively serving as the second-in-command and a capable assistant to the committee’s president, Hina Sorasaki. Her birthday is December 22, and she stands 165 cm tall. Ako maintains rigorous personal standards and diligently handles the day-to-day operations of the organization, often working through the night in her devotion to Hina and Gehenna’s welfare. She presents a confident and ambitious exterior that can appear kind at first, but she is an unyielding enforcer of rules with zero tolerance for violators. Her dedication is driven by profound admiration for Hina, whom she loyally follows, though her overly familiar treatment and tendency to invade Hina’s personal space can sometimes annoy the president. Other students have nicknamed her “Hina’s pet” for being constantly at Hina’s side. Ako’s personality is marked by letting emotions guide her decisions, blurring professional and personal boundaries. She can be overbearing toward colleagues like Iori Shiromi and Chinatsu Hinomiya, and her impulsive behavior has led to reprimands from Hina, including being forced to write disciplinary reports after abusing her authority. In combat, she operates from the rear as a tactical analyst and commander, sharing intelligence to highlight enemy weaknesses, enhancing allies’ critical rate and damage with her EX skill “Reconnaissance Data,” providing periodic healing with “Supply Plan B,” and increasing allies’ critical damage. Her unique firearm, named Hot Shot, is a black Luger P08 pistol with a blue grip and trigger, issued upon her appointment. Ako has satin-blue hair in wavy twin tails with a side-swept fringe and an ahoge, and she wears Gehenna’s black uniform consisting of a chest-cutout dress, side-slit skirt, gartered thigh-high stockings, gloves, and elegant shoes. A light-grey crescent halo with geometric details floats above her. She has been involved in events such as a summer sale at a Kivotos mall, an unauthorized confrontation with the Abydos Task Force, and she appears in significant story arcs including the Eden Treaty and Where All Miracles Begin, as well as events like “Chairman Hina and her Summer Vacation” and “Sunlight Girls’ Night Song,” where she wears a special dress variant.