I found a mech, then got transported to a fantasy world!

Gavin Mathews was driving home from college when a giant mech appeared in the air and then crashed to the ground. He went to explore the wreck when it suddenly disappeared with him inside. It reappeared in the middle of a battle in a fantasy world. Now Gavin must try to survive in the new world with the pilot of the mech, which happens to be a strange girl. Let the fun begin!