Senyū.

Senyū is a 12-episode series produced by Ordet and based upon the manga of the same name by Robinson Haruhara.

Plot
Satan Rchimedes returns to the earth after being sealed for one thousand years by a hero. The King tries to seal Satan once again by dispatching descendants of the hero. However, it's troublesome to find the genuine descendants, the king chooses 75 hero-like people. This is an adventure of Alba, the hero No.45, and an his monitoring fighter Ross.