Secret Theft Tactics Onihei : Season 1 Episode 6

Heizo becomes accompanied by a thief named Zenpachi of Isa. He admired Heizo's ability and character and approached him with the idea to rob the estate of the notorious Ichigoro Masuya. On the day of the burglary, they escape with the cashbox. Zenpachi goes back inside claiming that he dropped the book of "Secret Theft Tactics."