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

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