Samurai Deeper Kyo

Set in Tokugawa Japan, this manga begins by following Shiina Yuya, a bounty hunter searching for her brother's murderer. However, Yuya quickly meets a medicine peddler named Mibu Kyoshiro, who turns out to be sharing a body with the feared samurai Demon Eyes Kyo. Over time, Mibu Kyoshiro and, to a lesser extant, Shiina Yuya recede from the story while Demon Eyes Kyo comes to the fore. Kyo's only stated wish is to regain his own body. Following this path leads Kyo, Yuya and a variety of fellow travelers into conflict with both the Tokugawa shogunate and the Mibu family, a group of super-strong, intelligent and violent people who have run Japan from the shadows for millennia.
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 in fighting. The Mibu Battle Dolls are gradually being killed by the "Death Disease". Muramasa's sister was the first to be killed by the 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.

Free Downloads OST Samurai Deeper Kyo
OP1 - Blue Requiem
ED1 - Love Deeper