S-Rank Monster no "Behemoth" dakedo, Neko to Machigawarete Elf Musume no Pet toshite Kurashitemasu  

I Am Behemoth of the S-Rank Monster, Im an S-Rank "Behemoth" Monster, but Im Living as a Pet of an Elf Girl, Sランクモンスターの《ベヒーモス》だけど、猫と間違われてエルフ娘の騎士〈ペット〉として暮らしてます

In this scenario, a valiant knight who was killed in combat is miraculously revived and transformed into a formidable beast with the appearance of a cute kitten. Despite being perceived as adorable by many, he retains his warrior's honor and the strength of a highly skilled S-ranked monster. He must now use his abilities to safeguard an enchanting elf who has chosen him as her beloved pet.

S-Rank Monster no "Behemoth" dakedo, Neko to Machigawarete Elf Musume no Pet toshite Kurashitemasu has been published in English as I'm a Behemoth, an S-Ranked Monster, but Mistaken for a Cat, I Live as an Elf Girl's Pet by Yen Press since April 21, 2020.