Isekai Cat and Grumpy Witch is a Manga/Manhwa/Manhua in english language, ANIMALS 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

Deep in the forest lives a lone old woman. One day, she summons a creature; not a dragon, not a chimera, but an ordinary cat from our world. Thus begins the daily life of a witch and a cat in the corner of another world.