High Schooler By Day, Royal Tutor by Night

So what happens when one day you make a mistake, have to tutor a crown prince in an alternate universe, your normal days officially come to an end. It's fine if one transmigrates, no problem, right? I'm a highschool student, who's life isn't that interesting to begin with, a little adventure wouldn't hurt. But who would have thought that this crown prince was so generous and allowed me to stay in my real world during the day, and tutor him during the night?