Tokyo's dark underbelly is where private investigator Gokuu Fuurinji works, navigating the city's most dangerous areas. After noticing that every detective who looks into arms dealer Genji Hakuryu winds up dead, Gokuu realizes he must handle the case himself. His investigation uncovers the existence of humans altered with strange powers, and he nearly falls victim to an assassin's mind control. But his luck changes when a mysterious person implants a supercomputer into Gokuu's left eye, granting him extraordinary hacking abilities. With this new power, Gokuu is ready to take on the mastermind behind the deaths of so many of his fellow detectives.

In this installment

Private investigator Gokuu Fuurinji is hired by Ryoko Kadoma to find her missing brother, Ryuu. But Gokuu quickly realizes this is no ordinary missing person case—Ryuu has been subjected to a dangerous genetic experiment that could turn him into an uncontrollable superhuman. Using the most advanced supercomputer in the world, which is implanted in his left eye, Gokuu sets out to track the boy down. As the investigation grows deeper and more complicated, Gokuu is forced to confront a grim choice: whether Ryuu can still be saved from his fate, or if stopping his complete transformation might require killing him.