Origin
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Masaki Tojyo was the son of Tomoharu Tojyo. He worked with his father at Tojyo Pharmaceutical and had a wife and a daughter: Kazuki. Hinoto predicted her that she would die twice for the Earth. Kazuki had a congenital disease and was condemned to die. Her father and grandfather tried to find a remedy to heal her. But they didn’t succeed and Kazuki died. Masaki promised her that he would bring her back.
Years past; Masaki and Tomoharu succeeded to clone partially Kazuki. In order to achieve the cloning and remembering his promise, Masaki sacrificed himself. The cloning was completed. The clone was called Nataku.