Oshiga (Kuroki) and Osono are sisters whose father was killed by Shinzaemon, Shinkichi's samurai father, due to a debt dispute. Upon his death, Oshiga and Osono's father vowed revenge for his wrongful murder. His body is dumped in a mysterious lake that's believed to be cursed and haunted by a woman, who was wrongfully killed by her husband many years ago. Shortly after, Shinzaemon kills his wife and himself, leaving their baby, Shinkichi, orphaned and in care of his uncle.