I Took over The Academy With a Single Sashimi Knife 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.nl fastest updating comic site. The Summary is

If I cut, it will be severed" I, who was once called the best swordsman in the nation, have fallen into a mobile game that I’ve only spent a bit of money on. Moreover, I’ve been bestowed with the “Blessing of the Sword God”…!