

A Little Help for Navigating The Mangas, Please
Hello, interested, potential Demon School Iruma Reader here. I'm posting here to ask for a little guidance for these 2 mangas, specifically how to get to IruMafia after the main series.
Context: I discovered the Mafia Manga of Iruma Kun and and it took my attention. I wanted to start reading it, but I knew that this was based off of the main manga (Welcome to Demon School Iruma).
I assume the spin off, while based from the main manga, could still be enjoyed without needing to reading the original. But that doesn't sit well with me; I would like to at least read a little bit of the source material before jumping into spin off territory, so I can better appreciate the characters and situations that play off differently than in the main manga and to show respect to the OG story.
So with your help, may someone let me know what is a good volume number to read up to that would inform me enough to hop on to the Mafia Spin off; any info would be greatly appreciated.
Also, no disrespect to online chapter readers (officially or pirated), but I prefer reading the manga's official, physical translated books from bookstores or the library (personal preference, I love to use manga as a way to get off of a screen) and so far 20 or so have been released, so any guidance within those conditions is definitely a huge help.
Thank you to anyone who is able to throw in their 2 cents and aid me in my Demon School Iruma journey. I hope to love both of the books as much as you all.