I'm sorry to tag you all but I just want to explain it further. Read this till the end if you will.
@feha @alu @TheOne320 @superdubes @Tomoemami @FantasyMaster @piracyknight @yukyakyuk @Warilized = Dies is the thug that Kosuke supposedly "beat up" before he was reincarnated. Remember that it was said that the situation was changed from "Kosuke getting hit by a train" into "beating up a thug who could defeat a bear with his bare hands"? Yup, that was Dies. He was mentioned by Kamijou (the bully) in Chapter 1 and by Kasai Souji (Fire Boy) in Chapter 17. Maybe I should add another extra PFN next time cuz the author doesn't freaking bother to explain stuff.
@kaminomikan @Xtroyer29 @Raudhbjorn = There is a LN for this but unfortunately it currently only has 4 translated chapters. The rest is in Japanese. But still, I've read it and it doesn't differ much from the Manga. It does give a more specified explanation but not by much.
@No1Kenkaku @Riger = Cat God is well known but only the Onmyojustsuhis and the higher ups like Chie know that he actually exists as a real life "cat".
@deathmailrock @Kyujyu = "Meh, I'll tell him later". That's literally the translation in a slang manner. Kuro is, for some odd reason, neglected to explain much to him. Just because he wants Kosuke to have a "normal" life as a high schooler.
@Leo80221 = It doesn't skip chapters
@CountryMage @DeathDonut @Jeirien = I absolutely agree with you. It gets more confusing every chapter.
@hayatekanzaki and
@WillTell = Your explanation is spot on
@deerafl = I also had that same train of thought that this world is a copy
Conclusion: Join the Discord to shit on -- I mean talk more about this Manga or Party Scans's other Mangas. Thank you.