Summoner of the Gods

An ordinary office worker transmigrates into a world invaded by a game, becoming a good-for-nothing. He awakens the rare Summoner class; he summons gods directly. He levels up with cheat-like abilities. He unlocks the power of the Investiture of the Gods, staging a comeback from nobody to a powerhouse, shaking up the world order. The whole world knows: don't mess with this Summoner.