Hiroya Oku (奥 浩哉 Oku Hiroya, born September 16, 1967) is a manga artist who is the creator of Gantz, Zero One and HEN, all of which have been serialized in Weekly Young Jump. He is finished working on his most renowned manga, Gantz, which began in July 2000. His manga often contain explicit violence and gore, as well as sexual situations.
He won the second prize of the Youth Manga Awards in 1988, under the pen name Yahiro Kuon.
He designed a character for Namco Bandai's Xbox 360 and PlayStation 3 fighting game, Soulcalibur IV named Shura.
Oku was born in Fukuoka, Fukuoka.
- There are two series of Hen; the first, with kanji, ran for 13 volumes—the first three are short story collections, and the remaining ten are a romantic comedy in which both leads are male. The short stories were later repackaged as "Aka" and "Kuro".
- The second series, 8 volumes, with the title only in romaji, is a romantic comedy in which both leads are women. This series has been adapted into an anime.
- There are only three volumes, about a video game tournament. It was not successful, and ended abruptly.
- It consists of 37 volumes. The first eight have been adapted into the first 21 episodes of the two seasons of the anime, with the final five episodes consisting of a different story that doesn't follow the manga.
- Three volumes in all, about a shut-in or hikikomori falling in love with his young stepmother after the death of his father.
- A story about an aging and ill salaryman who is transformed into a unstoppable battle machine after aliens accidentally destroy his body.
- A spin-off of Gantz with art by Keita Iizuka.