Levius

Levius (レビウス) is a manga written and illustrated by Haruhisa Nakata.

Plot
Young Levius has lost a lot in the war. His father is dead, and he lost an arm trying to protect his mother, who is comatose. Now his arm has been replaced by a metal prosthetic, and his Uncle Zacks has taken him in. The traumatized Levius soon begins to take an interest in cyborg boxing, and his uncle helps him get involved in the brutal sport.