Riki-Oh 2: Horobi no Ko  

The sequel to the RIKI-OH OVA Wall of Hell is called Child of Destruction. In this anime, we delve deeper into Rikis past by flashing back to his childhood. We learn about the tragic fate of his mother and how he was separated from his twin brother Nachi during a game of hide-and-seek. The series also introduces us to the significance of the six-pointed star emblazoned on Rikis hand, as well as the swastika on Nachis. Riki finds himself in the town of Misaki, which is home to illegal nuclear power plants and is ruled by a religious fanatic military organization called "Gods Judgment." He is captured and forced to fight in gladiatorial matches in an expansive arena. In Part 2, the violence intensifies as Riki fights against numerous soldier opponents with less restraint. However, his reunion with his brother Savior turns sour quickly due to their resentful feelings towards each other. Overall, Child of Destruction is a gory and intense sequel that explores Rikis past and delves into the dark side of humanity.