Three years ago, the hero Sion Blade used the power of the holy sword to seal the gate of hell, and the battle between humans and demons came to an end. However, due to the incomplete seal, the gate of hell opened again after a period of time, and demons from all over the world continue to emerge and attack humans. One day, three months after the gate of hell opened, the trap made by the ordinary and lustful farmer Toka Scott unexpectedly killed the hero Sion. In order to destroy the evidence, he buried the body of the hero Sion, but the next morning Toka became the appearance of the hero Sion. It turned out that the hero's former partner, the corpse magician Enri Heinsworth, used corpse magic to transfer Toka's spirit into the body of the hero. Then, the threatened Toka replaced the hero Sion and embarked on an adventure to seal the gate of hell with his childhood sweetheart Yuna!