After taking the blame for another disastrous advertising campaign, Ota Kiichiro is asked by his arrogant boss Otaki Ichiro to take his place as a judge at the world's biggest advertising competition in Los Angeles.
Jirokichi plays around during the day, but at night becomes a completely different person. His nickname is Nezumi-Kozo (“Rat Boy"). Jirokichi steals gold coins from corrupt samurai families and hands it over to the poor. He works with his younger sister Kosode.
