Mythology Revived: Battle Pets Invade, and I Appoint the Gods of the East!

Overnight, the world was engulfed by the bizarre.

A round moon with a smiling face appeared in the sky. Forests turned into rabbit trees over ten meters tall. Tiny witches were growing in the rice paddies. Ashes burned in the lakes... All kinds of strange monsters invaded the world, until a boy appeared with his little black cat. He turned every bizarre thing in the world into his own summoned beast!