King's Engine

An ascended weeb gets summoned by Truck-sama to be his champion in a battle of Gods. It's basically an everyday fanfic of a guy going to different worlds. It's starts in DxD. Although the MC uses his key to open many locks. Its will probably not be a harem story or may be it will be... who knows... "For his almighty Truck-sama, he shall go to any lengths, be it heaven or hell..."