If I had a nickel for every time being French has been useful for reading manga, I'd have one nickel.
Yeah, being French isn't worth it, you only get buffs to your vocabulary skill
From reading the first four chapters, all I've learned is that Japan is in a civil war, and that every person in there likes to say the word "fucking" and/or "kill" a lot (Edgy as shit, 0/10 wtf)