currency book

After dying, our main character found himself summoned by a young woman. She comes from a long line of summoners and had expected to partner up with a powerful being, like the rest of her family. Instead, she summoned a computer programmer, who from now on will be living inside her head. Powerless, he''''s unable to help her with the upcoming war. Disappointed that neither of them had been blessed by fate with some divine abilities, he decides to build a computer system inside her head himself.