Does a world hopping novel with zero romance even exist?! I’ve read plenty of BL and straight world hopping novels. But I can’t seem to find one without any? No romance or harems and shit like that. 48 Hours a Day that’s the only one I've read, but it still has romance.
Boss Level Face-slapping Specialist (has some romance, but just in a few arcs, and different soul each time)
The Witcher Has Loaded the Thriller Game Super Male God System Infinite Stream I Have the Evil God Source Code
Quick Transmigration Cannon Fodder’s Record of Counterattacks - as far as I remember it has no romance, I read it a long time ago so they might be bits and pieces but it's not the main genre.