When former Shinsengumi captain Saito Hajime arrives on the steps of Kamiya dojo, he challenges Kenshin to a duel that will force a reawakening of Kenshin's own past.
One hundred and forty years ago in Kyoto, with the coming of the American "Black Ships," there arose a warrior who, felling men with his bloodstained blade, gained the name Hitokiri, or Manslayer!
It is the near future, and student violence in schools is out of control. Hwajin Na becomes a supervisor of the Educational Rights Protection Bureau and is sent to a school where the collapse of authority is severe.