An F-rank good-for-nothing awakens a hidden talent and contracts the weakest little pet in history, only to discover it can evolve without limit. While his classmates are still gloating over their Bronze-rank spirit beasts, his cat has already devoured an S-rank ferocious beast. From last place in his class to humanity’s savior, he did just one thing: he treated his pet beast like a brother, not a tool.
