Zagan might be the most feared evil sorcerer, but when it comes to social interactions, he's the most inept. All those days studying the dark arts won't help him when he falls in love at first sight with Nephelia, the beautiful elven slave, and spends his entire fortune to purchase her. With no clue how to talk to each other, the awkward arrangement for a bumbling sorcerer and timid elf begins.

Rein is a Beast Tamer who fights alongside heroes to bring down the Demon King. But one day his comrades declare him useless and kick him out of the party, after which he decides to start a carefree life as an adventurer. During the test he must pass to become an adventurer, he runs into a girl named Kanade who is being attacked by a monster. Rein risks his life to make sure she can escape, but then she brings down the monster in one hit. It turns out that Kanade is from the inordinately powerful tribe of cat people, one of the strongest species! She becomes attracted to his combination of talent and gentle nature and asks: "Would you try to tame me?" Rein forms a contract with the strongest cat-eared girl and starts his new life as an adventurer. The heroes who kicked him out of the party, as well as other stronger species, take notice of his power.

In a world of idle gods, humans are forced into brain challenges with them. With three defeats, gods lose their right to challenge, while 10 victories spell human triumph. Fay, determined to achieve the impossible, enters the ultimate test of wits against the gods. Will he defy divinity, or is he just another loss in the making?