Airi Altinate earned the nickname "All A" through unrivaled academic excellence at the Hero Training Academy, where she viewed Raul Chaser as her chief rival. Her heroic ambitions collapsed after the Demon Lord's defeat prompted the Hero Program's cancellation. Publicly claiming employment as a protective security guard—an "everyday hero"—she instead concealed her true role: wearing a revealing bunny girl outfit at Amada, a Magic Shop Leon competitor, out of embarrassment and perceived indignity.

Her parents' demon-inflicted death forged an unyielding hatred toward all demonkind, rejecting any possibility of non-evil demons. This prejudice fueled hostility toward Fino Bloodstone, the Demon Lord's daughter, whose identity Raul hid. Airi harbored conflicted feelings for Raul, masking affection with tsundere denials of romantic interest. She scorned his retail career as abandonment of their heroic ideals, fueling competitive frustration.

During a confrontation at the abandoned academy, Airi attempted to kill Fino for vengeance but halted after Raul intervened, revealing a crack in her rigid beliefs. Her participation in an OVA scheme to deceive Raul's sister Miuri about his heroic success did not progress her personal development.