Ep. 19: The Mysterious Home Is Miyu's Real House?

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Miyu gets a letter from her parents telling her to visit their old home. More people came than expected. When they got to the home, they realized that the house was cleaner than when Miyu and her parents were living in it. She thinks someone is in the house. They find out that it's an alien named Souji from planet Osouji was cleaning up their home. (Source: Wikipedia)