Koshiro Matsudaira lives in Tanjousan Bun in Echigo as a commoner and surrounded by people that love him, including his father Sakubei, who works for the Tanjousan Bun. One day, many officials working for Tanjousan Bun come to Koshiro's house and Sakubei tells his son the shocking truth about his birth. Koshiro learns that he is the son of Daimyo Ikkosai of the Tanjousan Bun. Even more shocking to Koshiro, is that Daimyo Ikkosai has suddenly handed over his feudal lord position to Koshiro and has gone into retirement. Koshiro thinks that he has come across good fortune, but he soon learns that the Tanjousan Bun has a huge debt that needs to be payed off soon.
