Beheneko: The Elf-Girl's Cat Is Secretly an S-Ranked Monster! - S01

A young knight dies tragically while fighting demons to protect humanity, only to be reborn in the depths of a dungeon as a Behemoth-one of the very S-class monsters he once swore to destroy. At first, he appears as nothing more than a small orange kitten, hiding his true nature. Though he possesses the overpowered ability to absorb the skills of anything he eats, his escape from the dungeon leaves him near death. He’s found by Aria, a low-rank adventurer, who rescues and nurses him back to health, adopting him as her pet and naming him Tama. Despite his monstrous form, Tama clings to the knightly honor of his past life, pledging to protect Aria at any cost-even if it means throwing away his second chance at life.