Cybuster.

In 2040, the continuous pollution and the mysterious series of earthquakes left the city of Tokyo in ruins. A young man named Ken Ando is in training to become a member of DC, an army-like organization designed to investigate and protect the collapsing environment. Ken, with the support from his sister, Sayuri, gives his best to become a part of the elite group. But he receives the devastating news of being cut from the team because of his poor performances in the evaluation sessions. When an ominous monster suddenly appears from the sky with a blinding flash and starts mowing down DC's working robots with mysterious invisible forces. Ken, eager to show what he is truly made of, engages in a battle with the monster. Little does he realize his own fate and the fate of Earth itself may be linked to the mysterious Mech from another world.