Megaton Musashi

In an ordinary town, there are people who live a peaceful and fulfilling life. But they don't know that it is a false peace. The untold truth... The earth has already been destroyed... 99.9% of the human race has been wiped out by a mysterious alien force from outer space. The enemy is named "Dracters." Eventually, a large hole was drilled in the earth and terraformed into a suitable environment for the aliens to live. Humans have no choice ...

Tags: anime, based on video game, mecha