Rpg3 could have a notebook that can keep up with your leveling progress and other stuff. Such as How many more levels to go, breathing, and other statistics.
#Growth RPG3
amber sierra
dusky crystal
So like a quest and stat interface or whatever
warm pollen
how about as human you look at your blade for lvl and your hand (inscripted mark) for your rank, and as demon you can 'communicate' to muzan to figure out your rank and level
odd igloo
so a Resident Evil Type writter that saves data but its a book that keeps up with demon kills, lvl and whatnot
limber belfry
That's what it seems like