I don't usually do reviews nor am I a big fan of Star Wars but this story is quite captivating. An MC without a cheat ability, relying solely on his prior knowledge, is a great way to involve fans in the story.
ps:
People tend to not understand what a harem really is as does the author (no offense), and I understand that the term has become popular and is generally used as a stereotype BUT, the MC has a polyamorous relationship and that is not a harem.