Chisato tells his shocked grandson the whole story: his own son, Tatsuo's father, was a scientific genius beyond geniuses. In fact, he was so intelligent and unearthly that he was a mutant, a being of Newmanity ("Shinjinrui" - similar to that in Ishinomori's later creation, "Inazuman"). His wife, whom he married and had Tatsuo with, was a mutant as well. The couple conducted bizarre experiments that were capable of destroying humanity. Chisato feared this greatly, so, when Maya was born, he killed his own son and daughter-in-law, and sought to kill his grandson Tatsuo, who ended up being rescued and raised by Garo. He could not bring himself to kill Maya, however, and raised her to be his faithful servant. Maya then tells Skull Man that Chisato wanted to bring him back before he could do anything.