 His hate for the current human race was spurned by his father, who was a scientist of war; enemy soldiers had broken into Okuda's home and killed his mother before his eyes.His father gave up his part as a war scientist and began to research an antibody, which resulted in the creation of Chimeras.Sudo criticizes Okuda's scheme and Okuda shoots him, but Aiko's Chimera arm intercepts the bullet, before telling Okuda that she will kill him if he proceeds to steal anything precious from her (referring to Sudo).