Where's my sanity...? ( Corpse party fan fic)

The bloody and gore anime/manga/indie horror "Corpse party" has just gotten a new chapter in the story. Where's my sanity....?
A teenage red head who's bite is worst than her bark has teamed up with her friends and sister to try a little charm to keep their friendship strong after graduation, but something went wrong... a series of non stop murder and death appears in this strange realm they have fallen into... there's no possible escape that they know of... will all nine of them get killed? will some survive? or will they all live?