Board Thread:General Discussion/@comment-27662189-20160617011117/@comment-27662189-20160617023505

Ok So I've done some more research and discovered that there are a Total of 7 Trumpets meaning there are 4 we really know nothing about. We know the King of Salt and the Demon of Destruction and we also know that one of the Seraphs was used to end the world (The Identity of whom is unknown). So Mika, Kimizuki, Yoichi and his Sister's Seraph we know nothing about. However Akane may have been one of the Seraphs we know nothing about meaning two of the seven Seraphs are dead.

The most likely candidate for The Seraph that caused the Virus however is Kimizuki which would expain his sister's illness as she would have gained it due to proximity and it is stated that Memories are erased from the subjects which would explain why he would be none the wiser.

I say Kimizuki and not Yoichi or his sister because neither Kimizukis died and the Saotome's were seen alone during the time of the Virus' release where as the location of the Kimizukis at that time is still unknown.

Also this kinda ties into the theme of Kimizuki's guilt in comtemplating abandoning his sister that his demon often plagues him with as if/when he finds out he's the cause of his sister's illness it will only drive that nail deeper (and possibly allow him to be possessed by his demon).