It's the end of the world. No one knows quite how the infestation of strange, new monsters spread so quickly, but it's too late now. If it weren't for the violent new species, Lapisbloods, everything would have been fine... In this wild land, one of the rare survivors of this apocalypse continues living. But pretty much his entire life is turned upside down when he meets a strange Lapisblood that reminds him of someone... someone he knew. (This fic is also known as ''Excuse AU'', and the title is from the song "The Moon Will Sing" by the Crane Wives)