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Voiced by: Akiko Yajima (Japanese), Trina Nishimura (English)
A mysterious girl summoned by the human race for salvation, Luna was known as "the sun that was named moon," and has been dubbed the "Source of Life" — a living embodiment for the world. Deeming her a threat, Braiking Boss sent Casshern, Dio, and Leda to assassinate her. Casshern successfully did so, triggering the destruction of the world. Amid hints that she continues to exist in some form, Casshern searches for her to find the cause of the state of the world, and the reason behind his apparent immortality. When he finds her, however, she has changed and her dislike of death leads her to kill anyone who reeks of death.
It is discovered that humans once gained the secret to live eternally once their medical technology advanced. Braiking Boss was repulsed by this and began the extermination of humans. Mankind managed to barely survive through Luna. She granted humans normal lifespans because she had believed that without death, humans could not live. Braiking Boss sensed that a number of robots began to worship her as well, so he ordered her assassination which unknowingly set into motion the Ruin. After Casshern killed her, she mysteriously became disgusted and terrified of death and dying. She instead granted immortality to both humans and robots that she deemed to not be "reeking of death" or to those not too far into the suffering of the Ruin, as discovered when she refused to heal Dune. Luna sought to create a world free of death until all those dying of the Ruin will perish, leaving those that are immortal.