Makoto Kikuchi operates as the principal pilot of the humanoid weapon Nebula (Prometheus-2) for Mondenkind during the series' opening. She approaches IDOL units with clinical detachment, viewing them solely as repairable machinery. This stance sparks fierce ideological clashes with backup pilot Iori Minase, who perceives Nebula as a sentient partner. Their rivalry escalates when Makoto covertly alters Nebula's combat calculations to sabotage Iori's mission, injuring her and securing Makoto's position as Mondenkind's top pilot.

Her arrogance culminates during a confrontation with rival faction Turiavita. Ignoring retreat orders despite Nebula's malfunction, Makoto suffers a crushing defeat that results in her expulsion from Mondenkind. Stripped of her identity, she defects to Turiavita and takes control of their IDOL unit Hiems (Prometheus-5), channeling her fury into vengeance against Iori and former comrades.

Azusa Miura, whom Makoto calls "Onee-chan," shares a years-long bond with her as her sole emotional refuge. They cohabitate, contrasting Makoto's otherwise frosty Mondenkind interactions. Though rarely vulnerable, Makoto harbors an aesthetic appreciation for crabs.

A pivotal duel against Iori, combined with Azusa's influence, shatters Makoto's vengeful resolve. Recognizing her misplaced obsessions, she reconciles with Iori. They forge a tactical partnership, setting aside differences to combat shared threats for the remainder of the series. Makoto retains short black hair, reflecting her pragmatic and focused demeanor.