"Became the Final Boss in a Magical Girl Game" is actually pretty good despite it being R-19. The corruption part is handled quite well, the heroines doesn't just suddenly change their personalities... Plus the romance isn't terrible

I read it a year ago because I thought it was interesting, then I read it till chapter 298 before dropping it. It was hella hot

Question : How did you manage to read all of this? It takes me around a week or two to read a WN till chapter 100, how are you doing all of this?

I just realized this is not in any of your lists, I thought it was in part 4.

Try it if you haven't, It's really good

https://www.novelupdates.com/series/no-i-said-its-mental-immunity/

I recommend : "I Became the Youngest Daughter of a Chaebol Family"

I don't understand 80% of what's happening, but I feel entertained

As well as "I Became a Swordsman in the Middle Ages" a very eccentric and entertaining protagonist. She's a true gamer, surprisingly good despite the generic title