Nico ニコ

He is one of the main protagonists of the anime and web manga series. He is in Nanba Prison for unknowingly buying and selling drugs in the slums.

At an unknown point in time, Nico was used as a recyclable test subject as his body is able to return to normal after being injected drugs and medicine. Due to the multiple experiments performed on Nico, his brain had suffered damages, causing his body to be unable to limit the amount of strength he uses. Due to this, Nico has to take medicine to avoid destroying his own body.

At some point, he met Jyugo at a prison and then later met Rock at a different prison and became good friends with him. Later he was captured and taken to Nanba Prison and since they have some of the best doctors and medical care in the world, the doctors there give him drugs and medicinal pills to treat his illnesses, he does not feel like escaping and ironically became somewhat a drug addict.!~