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Tsuna and Luna appear to be vampires and are twin sisters. They are the same age (17) and height but Luna is older by 3 hours and 22 minutes. (They look different because they had their hairs cut differently and dyed differently so people would tell them apart), Anyways, when Luna's boyfriend Zero, a wolf, comes in between them to take Luna away to make her his bride, Tsuna does not allow it. So Tsuna will need help from many other vampires to get her beloved sister back. Can she do it? Or will it be too late before Luna becomes Zero's bride?