AKA Shinkon gattai Godannar!!
In 2042, alien threats known as the Mimetic beasts laid waste to Japan. During a final battle against the Mimetic beasts, Saruwatari Goh defeats the alien “boss” and saves his future fiancé, Aoi Anna, with his robot, the Dannar.
Now, on their wedding day, the Mimetic beasts emerge after five years of tranquility. Goh and Dannar are called to action, forcing Goh to leave Anna at the altar.