Here is his character description, via IzanagiGames:
Raita (voiced by Yuma Uchida) is the younger of twins found guilty of a robbery-murder case. In contrast to his older brother who easily gets upset, he is calm and gentle. Before being imprisoned, he was a top-flight company employee. He claims that he was falsely accused and intends to win the Yurukill Games together with his twin.
Watch the trailer below.