You and your sisters must solve the problem of low birth rate in Japan: In a Japan facing a severe birth crisis, measures to encourage population growth have reached extreme levels. Akira, your father, decides to take matters into his own hands, concerned about the future of the family and the country. With a firm resolve, he takes you and your sisters, Mio and Rio, to a luxurious house located in a remote forest, designed specifically to "solve" this problem.