S-Rank Monster no "Behemoth" Dakedo, Neko to Machigawarete Elf Musume no Pet to Shite Kurashitemasu

A knight is reborn as a baby behemoth that looks an awful lot like an adorable house cat. His situation grows even more confusing when a beautiful elven adventurer mistakes him for a furry feline and adopts him as her pet. (Source: HIDIVE)