O-Parts Hunter, more commonly known as , is a Japanese manga

Manga

Manga is the Japanese word for "comics" and consists of comics and print cartoons . In the West, the term "manga" has been appropriated to refer specifically to comics created in Japan, or by Japanese authors, in the Japanese language and conforming to the style developed in Japan in the late 19th...

 series written and illustrated by Seishi Kishimoto

Seishi Kishimoto

is a Japanese manga artist. He is best known for 666 Satan, which was serialized in Japan by Monthly Shōnen Gangan from 2001 to 2007 and licensed by VIZ in North America as O-Parts Hunter. His older twin brother, Masashi Kishimoto, is also a manga artist and creator of Naruto...

. It was originally published by Enix

Enix

The was a Japanese company that produced video games, anime and manga. The company was founded by Yasuhiro Fukushima on September 22, 1975 as and renamed Enix in 1982...

, who later became Square Enix

Square Enix

is a Japanese video game and publishing company best known for its console role-playing game franchises, which include the Final Fantasy series, the Dragon Quest series, and the action-RPG Kingdom Hearts series...

, in their Monthly Shōnen Gangan

Monthly Shonen Gangan

is a manga imprint of Square Enix . It publishes manga in several magazines aimed at different reader demographic groups in the Japanese market. Its magazines are home to some popular manga series which were adapted into anime series, like Fullmetal Alchemist, Moribito: Guardian of the Spirit,...

magazine from 2001 and 2007, and later collected into 19 tankōbon

Tankobon

, with a literal meaning close to "independently appearing book", is the Japanese term for a book that is complete in itself and is not part of a series , though the manga industry uses it for volumes which may be in a series...

 volumes. The series draws heavily from Kabbalistic traditions

Kabbalah

Kabbalah/Kabala is a discipline and school of thought concerned with the esoteric aspect of Rabbinic Judaism. It was systematized in 11th-13th century Hachmei Provence and Spain, and again after the Expulsion from Spain, in 16th century Ottoman Palestine...

 and Judeo-Christian

Judeo-Christian

Judeo-Christian is a term used in the United States since the 1940s to refer to standards of ethics said to be held in common by Judaism and Christianity, for example the Ten Commandments...

 demonology

Demonology

Demonology is the systematic study of demons or beliefs about demons. It is the branch of theology relating to superhuman beings who are not gods. It deals both with benevolent beings that have no circle of worshippers or so limited a circle as to be below the rank of gods, and with malevolent...

 for its plot, and less so on Japanese folklore

Japanese folklore

The folklore of Japan is heavily influenced by both Shinto and Buddhism, the two primary religions in the country. It often involves humorous or bizarre characters and situations and also includes an assortment of supernatural beings, such as bodhisattva, kami , yōkai , yūrei ,...

. It was released in English by Viz Media

VIZ Media

VIZ Media, LLC, headquartered in San Francisco, is an anime, manga, and Japanese entertainment company. It was founded in 1986 as VIZ LLC. In 2005, VIZ LLC and ShoPro Entertainment merged to form the current VIZ Media LLC, which is jointly owned by Japanese publishers Shogakukan and Shueisha, and...

, who released it under the title O-Parts Hunter.
Set in the near future, it tells the story of Ruby, an ordinary girl, who became a treasure hunter after her life is changed dramatically when her father, who was also a treasure hunter, dies.