In 2049, Sawatari Yuuma is an elementary school kid who loves everything about space and astronomy. He was initially excited when his parents bought a robot called Nanako, but he was disappointed when he learned that she was basically just a boring housekeeping robot. However, when he does finally try to talk to her about space, something strange happens. Her system crashes and is taken over by what claims to be a marooned alien ship! The alien ship wants Yuuma's help to get back to space!

It's the year 2038, but more importantly, it's summer. A little boy named Yuma is obsessed with the impending return of the Arville Comet. Then, one day, he sneaks onto the roof of an apartment building and finds something even more amazing—something not from this world. Now Yuma and his friends, and his hovering autopet Nanako, must work together to uncover a secret that's slumbered in the Earth for years, as dawn breaks over a new era for him and for humanity...
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(Source: Kodansha US)

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