Edo is plagued by a mysterious thief who steals from the storehouses of the greedy Daimyo and distributee the money to the poor. The people call him Lightning Boy. Sabu is out to catch him, but Ichi, is less enthusiastic after encountering him during the night. Meanwhile, at the Tanba clan mansion the caretaker and storage manager have been embezzling large amounts of money and decide to blame Lightning Boy for the theft. They also decide to scapegoat the chief officer Shonosuke...