Due to how messed up the plot were the author himself made the fan fiction ending where the protagonist get helped by Jotaro a canon. That's where it became popular. Cause of JoJo.
No clue why her student ID is on a ship girl, but gal's name is Ayame Kajou(aka Blue Snow) from A boring World Where the Concept of Dirty Jokes Doesn't Exist She has a fetish about wearing panties on her head, and enjoys making people uncomfortable with Lewd jokes and saying random dirty words that are sexual in nature.
Huh, guess so, I just remembered Ayame looked very similar and had a braids. But not that i look deeper it's just a single one *shrug* oh well xD *pointedly ignores the 6 digit number after a brief google search*