List of O-Parts Hunter chapters

Story arcs

01-53 Pre Time-Skip

• 01 - Introduction
• 02-03 - Thorn Ruins
• 05-06 - Zero Flashback
• 07-24 - Entotsu City
• 25-27 - Dust Storm Ruins
• 28-29 - Umbrella Cactus's
• 30-53 - Rock Bird

54-76 Post Time-Skip

• 54-55 - Reintroduction
• 56-62 - Ruby Retrieval
• 63-76 - Assault on Zenom Headquarters

Volume List

Volume 1

Jio is a young boy with a tragic past who only trusts one thing in the world: money. Little does he suspect that he is also a very powerful O.P.T., and inside him sleeps a demon of incredible ferocity. He meets up with a girl named Ruby, and together they decide to embark on a dangerous quest to discover as many O-Parts as they can. Will Jio help Ruby realize her dream of becoming a world famous treasure hunter? More importantly, will Ruby help Jio realize his dream--of world domination?!

• Chapter 1 - The Friends

• Chapter 2 - Dream 1

• Chapter 3 - Dreams 2

Volume 2

The government of Stea is on the hunt for a pair of rogue O-Parts users. Armed with a high-class piece of weaponry, this devious pair of lawbreaking brothers is ready to hit Stea's special squad with everything they have. Will an even more powerful O.P.T. be able to stop their violence? Later, Jio's past comes into focus when more is revealed about the origin of his unique O-Part and the identity of his master: a powerful wolf named Zero!

• Chapter 4 - The 5 O-Parts

• Chapter 5 - Lone Wolf

• Chapter 6 - Fangs

• Chapter 7 - The City of Fog

• Chapter 8 - The Resistance

Volume 3

Jio and his new friend Ball, a member of the resistance group fighting against the corrupt Governor Jaaga, are in deep trouble. They've successfully broken into Jaaga's lair, but are they strong enough to survive a battle with the notorious criminal Wise Yuri? Later, Ruby learns more about her father and the secret origin of the pendant he gave her before his mysterious disappearance. Could Ruby's seemingly unimpressive trinket actually be one of the most powerful O-Parts of all?!

• Chapter 9: The Crimson Magician

• Chapter 10: Escape

• Chapter 11: The Power of the Ancient Civilization

• Chapter 12: The Three Tests

• Chapter 13: Kirin Appears!?

Volume 4

His prized O-Part Zero now busted in two, Jio and Ball strike out to locate the only man who can help them: the mysterious and reclusive O-Parts appraiser Kirin. But when they arrive at Kirin's abode, a cotton candy-like canine greets them instead. Is Kirin, a being so feared for his strength that even the Stea government won't bother him, in fact just a puffy pooch? And will Jio and Ruby ever be reunited?

• Chapter 14: 2 versus 1

• Chapter 15: Burning Batman!

• Chapter 16: Mekisis Starting!

• Chapter 17: The Power of God

Volume 5

Jio's friend Ball always dreamed of being strong--strong enough to help the resistance movement stop the maniacal governor Jaaga who has a stranglehold on his hometown, and strong enough to defend his friends and his sister. Now that he too is an O.P.T., it looks like Ball might stand a chance! Can he, a novice when it comes to O-Parts, defeat a powerful member of the Zenom syndicate single-handed?

• Chapter 18: The Road Full of Hardships

• Chapter 19: Everyone's Thoughts

• Chapter 20: Last Plan

• Chapter 21: The Hearts Become One

• Chapter 22: Contract with the Devil

Volume 6

To defeat the legendary O-Part Mekesis, Jio was forced to make a dangerous pact with the evil spirit that dwells deep within his heart. Now that the time has come to resume his battle with the man responsible for shattering his old O-Part--Wise Yuri, the Crimson Magician--will Jio's newfound strength aid him in stopping this powerful O.P.T., or will his eternal soul be lost in the process?

• Chapter 23: The Old Enemy

• Chapter 24: The Blue Sky

• Gaiden: Justice

• Chapter Bonus: Trigger

Volume 7

Now that peace has returned to Entotsu City, Jio, Ruby and Ball strike out for the Ruin of Dastrom where they are told to search for a man named Wick--but the revelations Wick is about to confront them with will be anything but easy to swallow. Is it true that O-Parts are originally from another planet far, far away? And is Jio now strong enough to survive his next run-in with the ruthless Zenom Syndicate?

• Chapter 25: The Legend of the Spirit

• Chapter 26: Kabbalah

• Chapter 27: Dad, Mom

• Chapter 28: The Pilgrim of the Dark

Volume 8

A chance encounter and a case of mistaken identity pit Jio and Cross against each other in a battle that almost seems foreordained--and though Cross is unaware of the creature lurking inside Jio's heart, he can't fight the strange feeling that they've met somewhere before. Will Ruby be able to intervene before these two formidable O.P.T.s tear each other apart?

• Chapter 29: The Two Who are Bound to Fate

• Chapter 30: The Kabbalah's Angelic Recipe

• Chapter 31: The Olympiad Preliminaries Begins

• Chapter 32: The Chosen Two

Volume 9

The Olympia tournament has begun, and Jio is ready to do battle in the preliminary rounds! But his opponent Anna has some wily tricks up her sleeve...as does Ikaros, the leader of Rock Bird! The action heats up when the tournament moves to a spherical arena where participants can fight in zero gravity! Along the way, Jio meets some more of his fellow contestants, including the steadfast Kaito and his ailing friend Yuria. Can Jio win the tournament and help his newfound friends?

• Chapter 33: Mysterious Bird
• Chapter 34: Olympia Final Stage Starts!
• Chapter 35: Promise
• Chapter 36: Definitely's Volume

Volume 10

• Chapter 37:The Real Monster
• Chapter 38:The Real Monster 2
• Chapter 39:The Bird in a Cage
• Chapter 40:Heart and Shape

Volume 11

• Chapter 41:Hope
• Chapter 42:
• Chapter 43:Theory of the World
• Chapter 44:The Big Bang

Volume 12

• Chapter 45:
• Chapter 46:Evil King Icaros
• Chapter 47:Heart
• Chapter 48:Kaballah's Devil

Volume 13

• Chapter 49:
• Chapter 50:1 Hit
• Chapter 51:Light and Dark
• Chapter 52:The Key of Solomon

Volume 14

• Chapter 53:Bonds
• Chapter 54:Ancient People
• Chapter 55:Legendary O-Parts
• Chapter 56:New Member

Volume 15

• Chapter 57:Break In!
• Chapter 58:Everyone's Fight
• Chapter 59:Magic Trick
• Chapter 60:Miko's Truth

Volume 16

• Chapter 61:Welcome Home
• Chapter 62:
• Chapter 63:Full Moon
• Chapter 64:Zenom's Headquarters

Volume 17

• Chapter 65: The Ruins' Traps!
• Chapter 66: Heart
• Chapter 67: Brothers face off! Memories of the scars!
• Chapter 68: Father's Thoughts

Volume 18

• Chapter 69: Life
• Chapter 70: The Heart of a Woman
• Chapter 71: Devil's Summon
• Chapter 72: 2 Battles

No Volume

• Chapter 73: Zenom
• Chapter 74: Pinky Swear
• Chapter 75: Armageddon
• Chapter 76: Jio=Freed