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kinda interesting to see his (and shiraishi's) rendering gets more softer between the gap during raidou 1 and SJ
probably even more in those en ef tees collab art
if you sorta notice, it's not pure airbrush but there's some other "soft" pen used in it
either they stack tons of colors or idk magic watercolor brush that blends depending on your pen pressure
it's magic
I dunno if it's an actual custom textured pen(cil), a black lineart set at multiply layers, or a pitch black line art or an grain that accidentally pops in due to printing(?)