O-Parts Hunter, Vol. 3 — Seishi Kishimoto

Jio and his new friend Ball, a member of the resistance group fighting
against the corrupt Governor Jaga, are in deep trouble. They've
successfully broken into Jaga's lair, but are they strong enough to
survive a battle with the notorious criminal Wise Yury? 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?!