The story begins when main character Kazumanosuke Kiryu, a bodyguard who will take on any job if the price is right, is approached by a young girl named Haruka. She asks Kiryu to kill Musashi Miyamoto. Musashi Miyamoto is actually Kiryu's past self, and the name he goes by when outside of Gion. This, incidentally, is the same historical Musashi Miyamoto who's regarded as one of the finest swordsmen.