Description
Ako Amau serves as administrative officer of Gehenna Academy's Disciplinary Committee, known as the Prefect Team. She operates as a capable assistant to chairwoman Hina Sorasaki, displaying knight-like devotion through all-night work sessions. Beneath her professional exterior lie rigorous personal standards that enable effective leadership in Hina's absence, though stress can trigger boundary-crossing paranoia. Though often unapproachable, her actions consistently prioritize Hina and Gehenna's welfare. She exhibits initial coldness toward SCHALE's advisor Sensei that evolves into stressful concern, reflecting her near-obsessive loyalty.

Her appearance features satin-blue hair in wavy twin tails with a side-swept fringe and ahoge. She wears Gehenna's black uniform: 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 meticulously maintains a black Luger P08 pistol with blue grip and trigger, issued upon her appointment.

Ako appears in the 1.5th Anniversary Short Animation during a Kivotos mall summer sale, collaborating with Prefect Team, Make-Up Work Club, and Hyakkiyako Alliance members against automated turrets. Her narrative roles include Volume 1's unauthorized confrontation with Sensei and Abydos Task Force (resulting in disciplinary action) and later assistance under Hina's orders. She features significantly in Volume 3: Eden Treaty and Volume F: Where All Miracles Begin (Chapters 2-4), plus events like "Chairman Hina and her Summer Vacation," "Get Set, Go! Kivotos Halo Games," and "Sunlight Girls' Night Song" where she dons a special dress variant at a Pandemonium Society party.

In combat support, her EX skill "Reconnaissance Data" enhances an ally's critical rate and damage for 16 seconds. Basic skill "Supply Plan B" provides periodic ally HP healing. Passives "Initiate Support" boosts her healing, while "Please leave the support to us!" increases allies' critical damage.