The Hero Summoned from Another World is a Cat is a Manga/Manhwa/Manhua in english language, DEMONS 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

In a world where the demon king who has long laid dormant has reawakened, mankind decided to summon a hero from another world to stand against him. However, the one that appeared from the other world was an unfamiliar being, a 'cat'. This is an isekai fantasy where people from a world where cats do not exist fall head over heels for a cat's cuteness!