What Mary Katz, the chief executive of the Abumizawa Experiment Station, showed to Ryo and the others was the tragic appearance of a test subject whose ARMS transplant failed. Ryo and the others are stunned when they learn the secret of their birth. Keith besieged Abuzawa Village with fire to protect confidentiality. Gashley, Bii fights with the pride of a warrior. Katsumi suddenly kisses Ryo, who is about to rescue them... It was a promise to go home together.