My School Life Pretending To Be a Worthless Person - Chapter 100

I’ll be honest, this is the most confusing shit ever, he were fighting with “satan” and since then story was so badly done that I thought we were seeing a past mc version cause the monster king said they remember him from *** years ago but it was just mc, no clear explanation that’s so confusing, author should engage someone to write story it’s clearly not his forte, interesting but wrongly done