https://hive.blog/writing/@cheah/how-poor-worldbuilding-destroyed-talentless-nana
In summary:
"The poor worldbuilding of Talentless Nana makes the story come off as cheap and shallow. It is edgy for the sake of being edgy, dark just because it wants to differentiate itself from the superhero crowd, and features a sociopathic schoolgirl as a main character just 'coz."