Ryuu Kishi-dan de Ore Dake Neko Kishi is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

What the heck is a "cat knight"?! Transported to another world where cats don't exist, he has only his beloved cat to rely on. And... she's been turned into a giant!