The Story of a Cat That Has Lived for 100 Years is a Manga/Manhwa/Manhua in english language, ONESHOT series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

This is a story of a cat that has become immortal, wandering through the course of its lifetime to find happiness. Author's Twitter: https://twitter.com/kilightit