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O-Parts Hunter (aka 666 Satan) is a shonen manga series written and drawn by Seishi Kishimoto. The plot is centered around a girl named Ruby Crescent, and a young boy named Jio Freed, as they search for legendary O-parts and go on a grand adventure.


written and drawn by Seishi Kishimoto, the series ran in monthly Shonen Gangan from 2001 to 2007. Seishi published the first Tankobon volume on December 20th, 2001.


The plot is set in a mysterious futuristic world, and centeres around two main protagonists. Ruby Crescent, who wishes to follow in the footsteps of her father and become a treasure hunter of rare and powerful items known as O-parts; and Jio Freed, a boy with a mysterious past and monsterous strength who's goal is to rule the world. Together they search the world for these O-parts and learn to become OPT's (O-Part Tacticians), and as a result, take part on a grand adventure.

Publishing History

The manga was originally published in Japan by Square Enix in their monthly Shōnen Gangan from 2001 to 2007, and later published in several other countries by Viz Media, who subsequently changed its name to O-parts Hunter only in the United States to avoid offending people.


The main characters of O--parts hunter are all apart of the Crew of the Oraph, and their goal is to stop the Stea government and Zenom from collecting the Demons and angels and destroying the world.

Jio Freed

Jio is a kind-hearted and brave boy with a mysterious past. His goal is to rule the world, and he goes on many crazy adventures with the young O-part hunter named Ruby Crescent.

Ruby Crescent

Ruby is a teenage girl who's dream is to become a great O-parts hunter like her father. She travels on many crazy adventures with the boy Jio Freed.

Cross Biancina

Cross is an orphan child with a dark past. His only goal was once to kill Satan, but he now helps the vessel of Satan, Jio Freed, in an attempt to save the world.


Ball is a young O.P.T. who travels the world with Jio and Ruby. His dream is to become a great O.P.T like Jio Freed.


He has a dark past that involves the mysterious and malevolent Kujaku. While he has no real goal, he does travel with Jio to guide him and assist him when needed.

Book # Name Rating Release Date
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General Information Edit
English Name O-Parts Hunter
Japanese Name: 666~サタン~
Romaji: Roku Roku Roku Satan
Publisher Viz Media
Start Year 2001
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Aliases 666 Satan
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