1. Will there be a harem? - - No, there won't be. And there's no chance of changing my mind. I don't hate harem but there are so many of it already. Besides, I'm the worst harem writer there is. My only romantic experience was when I was helplessly "in love" with my seatmate in grade school. So don't come at me, people.
2. What about romance? - - Of course, you would be asking about that. Our protagonist will be in a platonic relationship in the future but no more than that. As I said, I've no experience in stuff like this. So if you don't wanna read something as cringy as "I will love you for the rest of my life because I laid my eyes on you for like… two seconds." Then don't even make me change my mind.
3. Is the protagonist OP af? If not, will he be in the future? - - Depends on your definition of what "overpowered" is. But if by OP, you mean he could destroy the universe by just sneezing alone, then sorry to disappoint you. Our protagonist will be using his common sense most of the time. He will rise into society with his skills and wits alone without destroying the galaxy. But don't expect an overly done plot armor. His ascension will be fair. I made it this way because I wanted a fiction character that would feel real and not just a fiction character. Someone we can relate to. But that is if I could pull it off.