In a time when there were swords with spirits dwelling in them, there was a warrior named Hisui with a "Drunken Sword." With the emperor ordering people to gather these Spirit Swords for him, Hisui spends his every day fighting assassins sent by the emperor and freelance Spirit Swords Hunters who simply want the reward money, all the while protecting his beloved childhood friend, Shirei. However, Shirei might not be what she seems to be...