First off, this is based on assumption that Heaven and Hell use same alphabet and Fiore can't read it because Heaven use other language.
THE PLACE IS A HELL
HADES, THE MINISTRY OF JUSTICE FAR EAST BRANCH
Vol 6 page 174
(G)ATHER A COMRADE
JUIN US ACUMA TEAM (don't ask why it's "juin" and not "join")
From teaser PV (don't have it, so I can't include pic)
AUTHOR IS TAMIKI WAKAKI
WEEKLY SHONEN SUNDAY
So based on it, the rune would read as
Ｒ U T P
Well, it doesn't make sense, but if you read it clockwise and counter-clockwise you can find this word :
NERAWARETEIRU : Being targeted
KIWOTUKERO : Be careful
Might need some more steps to fully decode it.