Gods' Games We Play, Vol. 1 (light novel)

When the gods grow bored, they decide to spice up their eternal existence bychallenging all takers in an ultimate battle of wits. Of course, these deities arecapricious, unfair, and incomprehensible at the best of times, so winning is virtuallyimpossible for a mere mortal. Even so, things are bound to get interesting when aformer goddess and a genius human boy team up in a bid to win the game to end allgames.