Typemoon: My IQ is Over 9000

Steve crossed over to Misaki City in the Bubble Era of the Type-Moon world, but he found that his start was somewhat peculiar. Except for possessing a world-shakingly brilliant mind with super learning and invention abilities as his initial cheat, he had no mysterious powers whatsoever. So, after painfully giving up on the idea of pushing the original story's main plot, this man could only look up at the stars. In any case, let’s start by saving the world and racking up enough achievements to enter the Throne of Heroes. — Description from novelcodex.org