Infernal Weapons grant their wielders incredible power, but as each blade and hammer hosts an evil spirit, contracting their services requires a price few are willing to pay. Even the few who can master a demonic weapon without becoming it's slave, the Chrysalis, are destined to slowly lose their humanity, transforming into beings of pure violence known as Busoma. For years, the secretive Shoshidai have sought to gather all such devices and hide them away, but not even they can always resist the temptation to take the weapons for themselves. What chance, then, does young Gai Ogata stand after his dying mother, possessed by the sword, Shiryu, leaves it for his infant hands? And when his own arm is destroyed and replaced with one made from that same sword, all hell will be unleashed in SWORD GAI!