Zero 0 – Transcending the Future with Space-Time Magic 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

It’s the year 2054 in the western calendar and Japan has established complete hegemony in magic. Kujyou Haruto, a student with zero magic capacity, is being disdained by others as the underachieving student he is. Then, one day, a “strange letter” is delivered to him. The sender is himself, 10 years from now. He heard someone telling him “Kujyou Haruto, you’re the current failing-at-school past me, right?”, “In the future, you will be a mage who is able to manipulate space and time”, “From now on, just do as I say”. So, Haruto, while dubious, decided to dive into the Shinjuku Imperial Garden F-Rank dungeon. And there it was! An unknown hidden room!! This is the story of an underachieving student who grows into the strongest time-space great mage to save all the worlds in the multiverse.