Description
Rikuhachima Aru, a second-year Gehenna Academy student, declares herself the mastermind behind Problem Solver 68—a club accepting commissions ranging from mundane tasks to illicit operations. She cultivates an image of calculated menace, projecting haughtiness and criminal flair, yet cracks under pressure or mockery to expose her earnest, detail-oriented core. Beneath the performative delinquency lies an artistically inclined introvert driven by an insatiable curiosity for underworld mechanics.

Her striking visage pairs long pink hair with bangs veiling watchful eyes, wine-red horns adorned with gold filigree, and a crimson captain’s coat accentuated by gilded high-heeled boots. The customized PSG-1 sniper rifle "Wine Red • Admire" serves as both weapon and theatrical prop, complementing a crescent-shaped halo pierced by horizontal spikes—a self-fashioned crown for her "demon queen" persona.

Aru’s relentless pursuit of legitimacy for Problem Solver 64 as a feared syndicate routinely backfires, tarnishing the group’s standing through miscalculations. She obsessively courts approval, especially from Sensei, doggedly recruiting them despite repeated rejections. Though lacking tactical brilliance, she compensates with tenacity and rapid improvisation, pivoting strategies mid-crisis to salvage missions.

In *Beautiful Day Dreamer*, Aru occupies a peripheral role, credited among Gehenna’s ensemble without engaging directly in the Game Development Department’s dream-centric plot. Her cameo reinforces her status as a fixture within the academy’s ecosystem, consistent with her established duality: the chasm between her grandiose criminal aspirations and the earnest, bumbling reality of her climb toward notoriety.