Raiden Yoshioka, a 34-year-old ex-police officer turned private detective, stumbles into a clandestine war after crossing paths with Kei and Ai—a duo posing as father and daughter—during an unauthorized investigation. This chance meeting pulls him into the orbit of Fraud, a shadowy organization hunting Ai for her unique capacity as a "Trigger" to enhance psychic powers. A devoted gearhead, Raiden navigates the urban sprawl in a modified Alpina (BMW-based), his mechanical prowess mirroring his methodical approach to sleuthing.

His personal life fractures when his wife, Akemi, becomes a vessel for the enigmatic entity Alloy, straining their marriage. Complicating matters further is K2, a feminized replica of Kei, initially dispatched to eliminate Ai. After losing her memories, K2 abandons her mission and forms a tentative alliance with Raiden, blurring the lines between enemy and ally.

A vengeful gang from his law enforcement days resurfaces, targeting him for exposing their corruption—a testament to his unyielding moral code. Despite lacking psychic abilities, Raiden’s grit and investigative acumen make him a crucial figure in shielding Ai and dismantling Fraud’s schemes.

His journey revolves around reconciling fractured loyalties: duty to Akemi clashes with his protective bond with K2, while his past as a cop collides with present dangers. Though his skills remain static, his resolve solidifies as the anchor grounding psychically gifted allies in a reality where humanity and machinery intersect.