A new discovered 10th planet, called Lametal, will collide with earth on 9th September 1999. While the impact won't affect the giant ice planet critically, earth will be destroyed.
Yayoi, daughter of Lametal's queen and entrusted with the mission to abduct a large number of humans for slavery, befriends the orphaned boy Hajime and starts to question the intentions of her mother. Together with her human family and friends, she takes up the fight against Lametal and searches for a way to avoid earth's destruction.


The year is 1999. Amamori Hajime is just a normal, everyday elementary school student, trying to study and hanging out with his crazy pals. But then one day as his father is testing a piece of equipment he has been working on, something causes it to blow up, taking the house with it! Now orphaned, Hajime is taken in by his uncle, who is an astronomer. There at his uncle's observatory, he meets a girl he's seen before and developed somewhat of a crush on. He finds out her name is Yukino Yayoi, and her parents run a ramen shop in town. But even better than that, she's his uncle's assistant! What luck! 
But Yayoi isn't exactly what she seems. There is a reason she helps out Amamori-san at the observatory. She is the Millennial Queen (Sen-Nen Joou), specially chosen by her home planet, LaMetal, to go to Earth and help prepare for the possible annihilation of the planet. What will cause this disaster? LaMetal has an extremely elliptical orbit, which sends it very, very near Earth every 1000 years. When it gets close enough, the earth reacts, causing all sorts of natural disasters. Although she was chosen with the idea of protecting LaMetal in mind, her personal plan is to evacuate as many humans as she can to LaMetal, so if their planet is destroyed, they will survive. 
However, there is one person who strives to stop her plan, the head of the Millennial Theives. Why does he want to stop Yayoi? And how does he know about the Millennial Queen, anyway? 
(Source: AniDB)

AD 1999, the Earth was in a critical situation; a planet Lar Metal was approaching to the Earth. Meanwhile, Yukino Yayoi was heard about Lar Metal from Dr. Amamori of Tokyo Observatory. She was a junior high school teacher, but she also worked for Dr. Amamori who appreciated her astronomical knowledge. Actually Yukino Yayoi was Queen Millennia who had come from Lar Metal 1000 years before, and she had been watching human beings since then. 
Soon, numerous meteors fell on the Earth, and people were in panic. In this catastrophe, Hajime, who was a student of Yayoi, came to help Yayoi. Yayoi invited him into a big cave under the ground. 
(Source: AnimeNfo)

The artificial sun that lights the frozen planet La Metalle is dying, threatening to extinguish what little life is left there. Queen La Andromeda Prometheum decides that the only way for her people to survive is for them to submit to Hardgear's transformation process, which will turn everyone's body into machines. The Queen's daughters, Emeraldas and Maetel, refuse to submit to this process, and fight to stay human. 
(Source: Anime News Network)

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