I have a single condition for my comrades... and it's to never betray me! The contract that the lonely boy made with the girl to survive in another world is...

Riki Kanno was betrayed by his best friend and died an unnatural death. When he awoke, he came face-to-face with scenery of an unfamiliar other world. He became an adventurer and set out to hunt magical beasts, but because of his experience with betrayal, he keeps failing to find comrades... Just when he was at a loss, he meets a scarred girl named Aria Rose. Aria Rose was imprisoned from the moment she was born, and Riki offers her a condition. "I'll set you free when you work enough for three gold coins. Can you fight? Will you survive? Or will you die?" The adventures of a boy who can't forgive his betrayal and a girl who doesn't know freedom begin now!