I'm a Behemoth, an S-Ranked Monster, but Mistaken for a Cat, I Live as an Elf Girl's Pet, Vol. 7 (manga) — Nozomi Ginyoku

HAPPY AS THE CAT THAT GOT THE CREAM TO BE HOME!

After putting a stop to both the heinous crimes of the Earl of Gladstone and Leis's tragic quest for revenge-plus taking out an undead dragon in the process- Aria's party has earned a promotion to A-rank! With this change in fortune and the addition of the fairies Lily and Feri to the party, it's time for them to move to a new place big enough for everyone! But becoming high-ranked adventurers isn't all fun and games-with a rise in dangerous monsters in the labyrinth, they've been charged with culling them for the safety of the newbies...