The Dungeon of Black Company Vol. 9 by Youhei Yasumura

BACK TO THE FUTURE

After getting banished to a fantasy world full of corporate greed, Ninomiya Kinji used every devious trick he could imagine to take down the crooked Raiza'ha Corporation. But now he's been thrown into the distant past, where he's started building a brand-new company...with a girl named Raiza'ha! Isn't this some kind of time paradox?! With villainous adventurers and mysterious forces plotting in the shadows, history might be set to change in a major way!