Heavy Metal God Gravion

In the year 2041, Earth is under invasion by a mysterious alien force calling themselves the Zeravire. With no further communication, the Zeravire began to release armies of autonomous machines whose only purpose appears to be wanton destruction. The armies of the Earth Federation Alliance can barely contend with them, and are slowly being overrun. That's where you come in. Tricked by a too-good-to-be-true job application, you find yourself shanghaied from your home to a mysterious castle somewhere in western Europe, where the infamous, eccentric genius billionaire Klein Sandman resides with an army of maids. You, he explains, possess something called G-Factor...and he needs you to pilot the final unit needed to form his trump card against the Zeravire. "Bow down to our Heavy Metal God! GRAVION!" - By request, MECHtober continues! Part: Trifectum! - Once again, a loose adaptation of an obscure mech anime; this time it's Chojushin God Gravion (thanks Sysea2464204 for the suggestion!). Since Chojushin just means "Super-Heavy", I took a slight liberty for a more epic-sounding title. Includes some elements of Gravion Zwei, but AI models have no chill when it comes to secrets so I had to leave out most of the big plot reveals from Zwei and leave vague mysteries in their place. If you know, you know. - If requested I might add a route more similar to the canon where you replace Eiji instead of Toga, but Toga seemed to have the most easily replaceable personality on the crew and frankly, I figured people would want to be the main pilot and not just stuck sitting in the right leg every fight until missiles were needed.