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 and his monitoring fighter Ross.
I'm not too sure why the title has a period yet at the end, but it would be nice if it's more than a name gimmick. The anime may also air on Nico Nico Douga.