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

Aria and the gang have defeated evil the Earl of Gladstone, and put an end to Leis's sad chain of revenge. They even felled the undead dragon! Now it's time to reap the rewards: an enthusiastic welcome into the city they saved, a promotion to A-rank, and a well-earned rest! But soon enough, a new request heralds the start of a new adventure...!