Doomed by Fate

When Nathalia Lilac Ladeia falls ill to an unknown sickness that threatens to take her life, she makes a deal that she ends up regretting more than ever. After her sister, Arystillia Rose Ladeia, was turned into crystal, Nathalia searches for a way to free her but things don't go as she planned. CaiusxOC, HopexOC, NoelxSerah, SnowxSerah. Main story but becomes AU halfway through.