Sword Gai

Gai grows up with the swordsmith Amon after being found as an infant beside his dead mother in a forest. He becomes his guardian’s apprentice, but an accident at the forge costs him his right arm.

Amon makes a replacement from the demonic sword Shiryu. As the weapon’s power fuses with Gai’s body, he enters a struggle in which the boundary between a human being and a cursed instrument of battle begins to blur.