SRank Monster no Behemoth Dakedo Neko to Machigawarete Erufu Musume no Kishi Toshite Kurashitemasu

Elven girl Aria is an adventurer A small beast with an adorable face embraces Arias fruitful chest she decides to keep it as a pet and names it Tama At first sight its just an average cat but Aria has yet to notice that Tama is a former Knight and that his identity is not a cat but a young monster of the strongest class Behemoth