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It’s been 7 years since Yuuichi Aizawa visited his aunt Akiko, but now that his parents have gone to Africa to pursue their careers, he is finally back in the little northern town. Yuuichi is not really overjoyed with the prospect of living here though, because all of his memories of this place and the people living in it have mysteriously vanished. His cute cousin Nayuki seems like a stranger as well, even though he used to play with her all the time when they were younger. On the day of moving into his new home, Yuuichi starts unpacking the boxes and stumbles upon a red headband that no one seems to recognize. This is one of the first clues that will make Yuuichi take a stroll through the snow-covered town and make him start recalling fragments of his past, broken promises and buried secrets. Yuuichi soon realizes that there is something supernatural going on, and all of his new female acquaintances seem to have links to his forgotten past.

Astro is a robotic boy that posses super human powers and an artificial intelligence system that is unparalleled to any robot. His creator, Dr. Tenma, created him to replace his late son, Tovio. Dr. Tenma soon destroys his laboratory, after the creation of Astro, and shuts down Astro. Soon after, Dr. O'Shay, the head of the Ministry of Science revives Astro, and tries to give him a normal life as a 6th grade student that helps the police agency keep renegade robots and bigot humans from causing harm. Astro faces extreme racism for being a robot, and he must discover the truth about his creator Dr. Tenma.

Extra shorts that come after each episode. This entry also includes the Mai Hime vs. Mai Otome - "Moe"? The Greatest Battle! episode.

Second season.