When orphan Rosie learns of her brother Julian and that they are a part of the esteemed House Noart, she gains both riches and the greatest treasure of all—the pure love of family. But after an accident causes Julian to lose all memory of recent years, including Rosie's existence, she discovers House Noart has many hidden enemies. Preventing her family from falling to ruin is one thing, but will these siblings be able to prove that blood is not just thicker than water but lost memories as well?

After her only family, her older brother, lost his memory and no longer recognized her, she left the family to avoid being a burden. However, tragedy struck, and she was powerless to stop it.