Uchuu Taitei God Sigma

The story is set in the year 2050 AD, and mankind has been steadily advancing its space technology. However, the planet is suddenly set upon by a mysterious enemy: the forces of Eldar, who came from 250 years in the future. In their time, 2300 AD, their planet Eldar was invaded by Earth, and soundly defeated by Earths Trinity Energy, a mysterious energy used in their weaponry that possesses power many times that of a hydrogen bomb. The Eldar peoples objective is to steal this Trinity Energy before it can be used against them.