After being acquired by "Nanazon Prime Video," the TV station is set to restructure and dismiss departments that fail to generate high ratings. In order to ensure their survival, the shooting crew is devising an ambitious plan focused on the Banakawa Family. This family was once known for their immense wealth during the Edo period and is believed to have hidden their riches in an undiscovered cave. Even current surviving family members are not aware of this location. The crew's goal is to document the journey of their search for this elusive treasure in the underground world. This feat has eluded even major TV networks with substantial budgets thus far.