I think it sticks with me because I really hate replaying games a lot of the time, but twewy makes it a point to urge you to replay it, at least once, to get the full scope of its narrative and I think thats really cool.
I really can stress enough how the secret reports are such a cool incentive to have to replay the games. They not only will remind you of the context wherein your getting them, but also expanding on the narrative and the world building as well.
And i think it's also interesting that (if I'm remembering this right) one of the missions can reflect the parallel world theory in game in regards to Shadow Ramen. You see the results of a choice and how it branches off.
And the thing is that you don't even have to do any of this really.
The game already has a solid, emotional ending for its protagonist that you can be satisfied with.