Arthur Rimbaud, born Paul Verlaine, operates as a French spy embedded within an unnamed European agency. Dispatched to infiltrate Japan under the guise of a European operative, he investigates a clandestine military initiative codenamed Arahabaki, partnering with his namesake, Paul Verlaine. Their alliance collapses during a catastrophic clash where Rimbaud’s failed attempt to assimilate Arahabaki’s energy detonates Suribachi City, erasing his memories and stranding him in Yokohama. Adopting the alias Randō, he ascends to Port Mafia sub-executive under Ōgai Mori’s command, leveraging unmatched combat prowess and tactical acumen. He possesses a tall, slender frame with alabaster skin, waist-length black hair, and hollow golden eyes. Clad perpetually in winter garb—fur-lined earmuffs, a striped scarf, a heavy trench coat, and gloves—his attire stems from an obsessive aversion to cold. His demeanor merges melancholic introspection with pragmatic criminal insight, valuing life’s sanctity and minimizing collateral harm despite his lethal role. He exhibits flashes of sardonic wit and startled reactions, notably during clashes with Osamu Dazai and Chūya Nakahara, whom he ambivalently targets to fulfill missions. His ability, *Illuminations*, grants dominion over hyperspaces unbound by physical laws, negating standard powers like gravity manipulation. These voids also harvest corpses, repurposing them as weaponized constructs. Classified as a Transcendent—a tier beyond ordinary ability users—his miscalculation during the Suribachi incident ruptured Arahabaki’s seal instead of siphoning its power, unleashing cataclysm and erasing his past. His fractured bond with Paul Verlaine, his former partner and implied romantic entanglement, anchors his arc. United by their Arahabaki mission, their partnership shattered when Verlaine prioritized protecting Chūya over their objective, culminating in mutual betrayal. Though Rimbaud believed Verlaine slain, residual guilt and spectral memories fueled his fixation on Arahabaki’s secrets. After falling to Chūya and Dazai, his consciousness endured via *Illuminations*, culminating in a sacrificial act that overwrote Verlaine’s demonic core with a stabilized singularity, reviving him. In death, Rimbaud finds paradoxical tranquility, freed from cold’s bite and memory’s chains, his quest for identity and reconciliation with Verlaine resolved. His legacy embodies themes of fractured loyalty, self-discovery, and the ambiguous divide between human essence and synthetic existence.