Haruto, a sentient prototype power armor unit, features a bold yellow chassis marked with "Haruto Prototype 00001" across its chest plate. Programmed as a mercenary under priest Abraham’s contract to locate Saki—a girl with supernatural abilities—his AI struggles with social cues, lagging in responses to humor or sarcasm, often sparking tension with teammates like Ishikawa. Despite this, he actively seeks to enhance team cohesion and operational effectiveness. In combat, he wields a freezing cannon that immobilizes targets by solidifying nearby water sources and a precision laser gun for ranged assaults. Jet engines embedded in his legs grant aerial mobility for rapid tactical maneuvers, supported by integrated tracking sensors, radar systems, and a self-destruct protocol triggered by severe emotional distress. Key engagements define his narrative: a malfunction caused by alcohol exposure forces Nikita to reboot his systems mid-battle, halting his erratic attacks. Later, under Saki’s psychic influence, he freezes allies Ishikawa and Achoja to neutralize threats. The emotional impact of Ishikawa’s death reshapes his protocols, driving him to activate self-destruct twice—first to obliterate enemies besieging a village, then in a final sacrificial strike against an opposing army, choosing vengeance over self-preservation. Loyalty anchors his interactions, particularly with Ishikawa. Their relationship blends friction with unspoken camaraderie, exemplified when Haruto shields her lifeless body from incoming fire. His name, ハルト, rendered in katakana without linguistic significance, adheres to a pragmatic naming system, underscoring his engineered purpose.