O-Parts Hunter, Vol. 6 — Seishi Kishimoto

To defeat the legendary O-Part Mexis, 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 Yury, 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?