I Was Sold Dirt Cheap, But My Power Level Is Off the Charts Volume 2 (manga)

Vowing revenge for the murder of his first benefactor in the new world, Yuto prepares to take down the Ludawan Kingdom. First step: gathering funds. He claims bounties in deadly colosseum battles―but to Yuto’s surprise, he encounters an old classmate, sent along with him from Earth. Yuto expected friendship, but quickly finds that the rules have changed…