Official Site:http://websunday.net/rensai/set_ken.html
Information about the anime:http://www.wikipedia.org

Underlying the principle story arc of Kyo's search to reclaim his body, there are many smaller arcs, each leading to the next one. The basis of many later revelations are established many volumes in advance. In the manga, it is revealed that all of the Mibu, except for Kyo , are descendants of "Battle Dolls", creatures created by the Mibu to fight for their amusement. In time, the Battle Dolls come to believe they were the real Mibu, and that the real Mibu were destroyed by infighting. The extant Mibu are gradually being killed by the "Disease of Death". Muramasa's sister was the first to be killed by the Mibu Disease, but others soon followed. The disease manifests itself when the infected person reaches a certain age. For this reason, the aging process has been stopped in Antera, Tokito, and probably others.

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