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Dia is the reincarnation of Diamond but every time Diamond was reincarnated she would always be last because she would never be reincarnated when Spade, Clover, or the twin Hearts were reincarnated but one year she was reincarnated the same time. She was sent on a mission to find all of them and bring them back together( if that makes sense). They all have a mark on them, Dia has hers in her face but you have to read the story to find out where the other marks are because I'm too lazy to put it in the description.