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

I'm a Behemoth, an S-Ranked Monster, but Mistaken for a Cat, I Live as an Elf Girl's Pet is a 2-book series with 2 primary works first released in 2018 with contributions by Nozomi Ginyoku and Taro Shinonome.