Goku Midnight Eye (Original Japanese)

While investigating the murder case of his colleague, Goku receives a cybernetic eye transplant from a mysterious group, which can hack any computer network in the world.

Desperate Ryouko hires Goku to stop her brother Ryuu, an increasingly unstable, rampaging cyborg bent on revenge against their sadistic army father who ran the military experiment that turned Ryuu into an unstoppable killing machine.