I'm a 'Behemoth,' an S-Ranked Monster, but Mistaken for a Cat, I Live as an Elf Girl's Pet, Vol. 1

In this new series, a knight finds himself reincarnated as a behemoth, one of the most powerful monsters in the world, and when he meets a beautiful elf girl, he's ready to fight at her side. Problem is, a baby behemoth looks an awful lot...