In the not too distant future, mankind battles over O-Parts, powerful relics from an ancient civilization. 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-Parts Tactician (O.P.T.), and inside him sleeps a demon of incredible ferocity. With his partner, Ruby, Jio embarks on a dangerous quest to acquire as many O-Parts as he can.
Jio and his friends boldly set out to rescue Ruby from the Stea Government headquarters. Sneaking in is easy enough, but what will happen when they are forced to face their worst foe yet--Chief of Staff Dofwa--whom even Kirin and Amidaba have as yet been unable to defeat?