Beheneko: The Elf-Girl's Cat is Secretly an S-Ranked Monster!

A young knight dies while carrying out his vow to protect humanity in a battle against demons—only to awaken in the depths of a dungeon, reincarnated as a Behemoth. Now he’s become an S-class monster of overwhelming power, the very kind of threat he once swore to keep away from people.

Still a juvenile, he can pass for an ordinary orange cat, hiding an ability to absorb the skills of creatures he devours. After barely escaping the dungeon and suffering serious injuries, he’s discovered by Aria, a D-rank adventurer who nurses him back to health and takes him in as her pet, naming him Tama. With his former knightly pride intact, Tama accepts Aria as his master and resolves to protect her at any cost—even if it risks the second life he’s been given.