RAHXEPHON (Razefon), by Takeaki Momose, based on the series by BONES and Yutaka Izubuchi. First published in 2001 and first published in North America in 2004.
PLOT:
For years, Tokyo has been a world onto itself. The city is enveloped within a giant bubble, leaving those within unaware of the world outside. That's certainly true for Ayato Kamina, who spends his days with his adopted sister Reika and living the ordinary life of a high school student. One day Tokyo comes under attack and both he and Reika are saved by a member of the Terra Force. They reveal that Tokyo was sealed away by a mysterious race of beings known as the Mu, and that Ayako is the only person who can pilot Terra's greatest weapon: the giant battle robot RahXephon.
