The Brave Jet Black Wizard: I Got Betrayed By My Comrades So I United With The Ultimate Monster

Story:

I Got Betrayed By My Comrades So I United With The Ultimate Monster: It was said that Sion was the strongest hero in the world. He believed only in his friends. Only with them he wanted to defeat the lord of darkness! He swore with his company of heroes to defeat the darkness itself, but there was a disaster. The girls he trusted betrayed him. He stayed alive, but he remembered the betrayal for many years to come. He decided to give up his life and wanted to kill himself. Suddenly a monster appeared before him and asked Sion to kill him. The hero was weak, but could still fight the beast. But what did Sion do, as he wanted to lose his life?