The Mizuhanome System represents a cutting‑edge invention enabling individuals to access one of the most fascinating realms known—the human psyche, where thoughts and memories intertwine in complex patterns. By exploiting so‑called cognition particles remaining at the crime scene, investigators of Kura's elite unit can project a suspect"s unconscious mind into an uncanny torrent of thoughts within a simulated environment. Their mission is to navigate this mental plane, dubbed an id well, and expose the perpetrator"s identity.
Entry into id wells is restricted to those who have personally committed homicide, a rule that keeps the system from being misused. This applies to former cop Akihito Narihisago, who goes by 'Sakaido' within the id wells. Having once been a respected officer, tragedy befell him and he quickly found himself beyond the law"s reach.
Still, Narihisago keeps aiding Kura while confined, using his extensive knowledge of criminal psychology to guide investigations from within the id wells. Although his formidable investigative talent remains valuable, Narihisago realizes that beneath the seemingly isolated murders lies a far darker reality—a conspiracy that threatens to unravel everything he once believed.
