Caretaker of the Earth

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Fifteen years ago, newborn Ukai Nanoha and her mother were in a plane crash. Her mother died, but Nanoha was the sole survivor. The Great Demon Maou saved her by replacing her failing heart with his own.

Now, Maou has returned and demands his heart back. Nanoha moves into Mezon Aasu, a mansion for magical beings, where she becomes the caretaker. She still has Maou's heart, but living with him and managing the building full of supernatural residents proves complicated.

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