Maboroshi kurozukin - yami ni tobu kage (1967)

The small town Hira holds a secret in hidden gold. The Ninja Dai, also called "the bat" because he only flies by night comes to investigate the mystery posing as a young punk around town. The evil Rigen Yagyu of the Owari clan will do anything to stop Dai from finding the truth. "The bat" must use all his weapons and skills to beat the towns villains and exposing the truth.