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Plot Summary: The story centers around three siblings, twins Kanba and Shouma, and the ill sister, Himari Takakura. Himari passes away after going out on a trip with her brothers. She was however, miraculously saved by a spirit thriving in a penguin-shaped hat. In return for her extended life, the twins must search for an item known as the Penguin Drum with the aid of three penguins which are visible only to the siblings.