The Last Story give me some mixed feelings - I'd give 4.5 if I could, but since I've forced to choose between 4 and 5, I'll give it 5.
As far as the game goes, it's as someone said to me, it's a standard lewd corruption game with naive protagonist that has a message in its story. It definitely wants you play with the lewd element - virgin End A is only worth it for the material for LS. If you're expecting DHP or Bloody Virgin, this isn't that. But for what it's worth, I did tear up at the climax of End A and having literal God Mode turned on in the final fight was hype as fuck.
Speaking of fuck, the lewds are pretty good. Though, the really good stuff are either tied to some hassle or in the 4-5 Limit range. I never bothered with the defeat stuff, with exceptions the absurdly high leveled ones (with respect to when you can start dealing with them) in the underground. But overall it's well-paced and I'm pretty satisfied by the end. The art is great, the artist has really upped their game with the various arts and character designs are amazing. Even the guys aren't generic, and don't even get me to some of the sprite work in the later part which made the combat feels hyped.
Combat is... not bad? The dev definitely realized he made it too complex by LS... and then went on further with the option to 'optimise' your skills still being complicated choices (though in exchange you can get auto, passive, and powerful skills while cutting down your skill list by half). I don't really have a problem with it, it's just not very well communicated at first as to what the optimal responses are beyond the tutorial (it'll take a while to really get what the optimal moves are). Still, you can definitely have a lot of fun with it and it's definitely worth giving a try before turning on Story difficulty if it's not your thing.
Now that I've talked all that... LS. Last Story is definitely what people expected when they heard it's made by the same people who made Trash/Dark Hero Party. The overall point it's trying to make was good, the fights are hype IF you put aside the grinding and do want to interact with combat, and the new H-scenes are more meaningful than the main story. But it is a DLC and it shows.
The Last Story is rushed. Tseng is nowhere near as build up as Jace, and despite the time and effort they spent on him, he still feels like a giant flea from nowhere to me. The lines are too blunt, it's rushed and it has to tell its ideas instead of letting the idea breathe on its own in the story. The original cast isn't really used much, even Dina is mostly just used for her second-degree connection to Tseng. The angels/arcrod students' stories are not bad, but they don't have the same breathing room as DHP girls and the main PG cast. The combat was hype, but the level inflation is pretty crazy and you need to really pay attention. And ultimately, none of them got as hype and satisfying as End A's climax.
LS is so messy that I want to dock a point from the final score, it felt like it's there because people was expecting DHP and Bloody Virgin from U-ROOM, but I do appreciate the effort that is there and the main scenario IS a 5/5. I can't take off half a point, so I'll give it a final 5/5.