Nothing directly... They were usually harmless, unless you... went up to them and attacked one, I guess. N-not that I would! But enjoying a normal school life with them― [ He pulls a thick, longsleeved shirt off the rack, though he never size-checks it. Oh well! ]

― it meant you would disappear from the world. The, uh... the theory was you would be reincarnated, but... none of us knew for sure.