Naota is a 12-year-old boy who goes to school and lives with his father and grandfather. His life is then rudely interrupted by the arrival of Haruko Haruhara, whose search for the alien being Atomsk puts her at odds with Medical Mechanica. Naota then learns that he is being watched by Commander Amarao, who believes that Haruko is in love with Atomsk and that Medical Mechanica is out to conquer the galaxy. These circumstances soon get Naota involved in a battle between Haruko, Amarao and Medical Mechanica.
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