The only condition for becoming comrades is this—“Never betray me!”A dark battle fantasy about surviving in another world!!Riki Kanno was betrayed by his best friend and met a tragic death. But when he opens his eyes, an unfamiliar otherworldly landscape stretches out before him.Trying to survive, he goes monster hunting, only to be quickly defeated. He then attempts to form a party, but every effort to find companions ends in failure.Just as he falls into despair, he encounters a battered girl named Ariarose.Ariarose has been imprisoned ever since the moment she was born. To her, Riki makes a single proposal:“If you work enough to earn three gold coins, I’ll set you free.”Thus begins the adventure of a solitary boy and a girl who has never known freedom—.