Synopsis: S-Rank Monster no Behemoth Dakedo, Neko to Machigawarete Erufu Musume no Kishi (Pet) Toshite Kurashitemasu

The elven girl, "Aria," is an adventurer. A small creature with a cute face snuggles against Aria's ample chest, leading her to decide to adopt it as a pet, giving it the name "Tama." At first glance, it appears to be an ordinary cat, yet Aria remains unaware that Tama is actually a former Knight and that his true identity is not that of a cat, but rather a young monster of the highest class known as "Behemoth."