One day Nuku Nuku dropped in and began to live with the Natsume family. Having lost her memory, Nuku Nuku assumed the identity of a beautiful girl named Atsuko Higuchi. She was so beautiful and gentle, and besides, she was such a great cook that Ryunosuke, 14, was all smiles. However, after her arrival in town, a series of mysterious incidents started to happen in Maneki City: experimental machines running haywire, roaring fighter aircraft flying low, mass destruction in the city. In every case, a mysterious girl was spotted at the scene of the incident.

Source: AnimeNfo

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Alternative setting: Bannou Bunka Nekomusume (1998)