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

When the gods grow bored, they decide to spice up their eternal existencebychallenging all takers in an ultimate battle of wits! Of course, thesedeities arecapricious, unfair, and incomprehensible at the best of times, sowinning is virtuallyimpossible for a mere mortal. Even so, things are boundto get interesting when aformer goddess and a genius human boy team up in abid to win the game to end allgames!
Binding: Paperback / softback