Hiroya OkuHiroya Oku.

Hiroya Oku (奥 浩哉, Oku Hiroya; born September 16, 1967) is a Japanese manga artist, known for his works Hen, Gantz, Inuyashiki, and Gigant. 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. His debut manga, Hen, was a runner-up in the 1988 Young Jump Youth Manga Awards.