Hiroya Oku is a Japanese manga artist, who is the creator of Gantz, Gigant, Hen and Inuyashiki, the first two of which have been serialized in Weekly Young Jump. Originally influenced by Katsuhiro Otomo and Ryoichi Ikegami, his manga often contain explicit violence, sexual depictions, and matters that are considered taboo by the public, and he is known as a pioneer in the use of digital processing for manga backgrounds.