Arata the Legend Season 1 Episode 3 E 3

Arata and Kotoha are taken to Gatoya, a penal colony widely known as "the ultimate hell," where they are immediately attacked by two boys named Kanate and Ginchi. A certain rumor has been spreading around Gatoya regarding Arata, the alleged murderer of the princess. Arata manages to escape harm, but is then separated from Kotoha when a part of Gatoya suddenly collapses around them.