Danganronpa V3 leveling to 99 fast (Mild Spoiler)

If you are like me, who isn't level 99 by the time you completed the story, you can come back to chapter 5 (investigation time) and do this for fast exp.
Sorry if I'm late by a couple of years lol, I just bought the game on Danganronpa 10th Anniversary sale. Feel free to ask me anything in the comment section if you have anything in mind, I'll answer them as best as I could.