To Love-Ru Darkness improves upon a lot of the things that were wrong in the original series, though that isn't too hard to do honestly.

Assuming you have already read the prequel, this manga is a continuation of the story, but it features something new and exciting: a plot. The first 2/3rds of it is focused more on the history behind Golden Darkness and her managing to change who she was fated to be. It was a great breath of fresh air for those coming off of the original series because it made it into a series you could kind of take seriously. The later third is then spent on the MC trying to figure out his feelings and deal with responding to each girl individually. You could say that it's more of the same, but this time I was actually slightly more invested because of the new stakes introduced.

Character-wise the story improved a lot too. One of the biggest reasons I didn't like the main series is because it failed to make me see any chemistry between a lot of the girls and the MC to the point where it just felt like things were happening but leading nowhere. However, this sequel gave more light onto why each girl might be attracted to the MC and made the MC more appealing as well. The focus also shifted off of the two main girls onto the side characters a lot more, which I liked since the main girls were rather boring. That being said, the girl that shows up the most in this sequel ended up becoming a little annoying just because she was always there, which I found to be unnecessary. But overall the improvement to characterization gave this series as well needed boost that made me interested in a lot more of the characters than the original.

There's still a bunch of problems with the series of course, with the overuse of nudity being the worst still, but I'm happy to see it improve so much. The one other really big thing I wish the author changed would be to finally pick a girl the MC wants to be with, but once again we are left with a cliffhanger where no one is chosen. It's honestly just frustrating at this point when we are given no payoff after reading for so long, but I guess complaining won't change anything about it.

Overall, To Love-Ru Darkness is a much better manga than the original series in terms of plot and characters, and it made me genuinely interested in most of the characters' development. It's still not amazing, but for a harem manga I do give it props. I'd definitely suggest it if you read the original and were unsatisfied with how it went.