Demon Eyes Kyo, or Onime no Kyo was called the Thousand Slayer for killing over 1,000 samurai during the battle of Sekigahara. He was finally defeated by a man named Mibu Kyoshiro. Four years later, Mibu Kyoshiro surfaces again. Inside him is Demon Eyes Kyo, waiting to come out and reclaim his body, which has been hidden somewhere in the forest of Aokigahara.