who is HHSU? (Patreon)

been cracking at these designs with my longtime friend buntcake (aka suguro - illustration of the covers for the first Adraen EP, Storm World, Silence, Neverland Soundgirls, etc)

don't go spoiling the fun for others - this is top secret stuff! classified! the most hidden of the hidden Halley Labs lore! so hush hush~!

people have theorized on and off for a while as to who is actually "in" HALLEY HARD SOUND UNIT. i thought it would be fun to subvert expectations and create three brand new chracters.

who or what are they? where did they come from? what relation could they possibly have to anything related to Halley Labs? i guess we'll find out soon.