Eleceed (EN) 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

Kaiden - A mysterious ability user who hides inside the body of a street cat. He is later picked up by Jiwoo after being injured after a fight with another ability user. He has a stubborn and bossy personality. Jiwoo - an energetic and talkative high school boy who loves cats. He is very kind and also seem to have a special ability.