"The older sister is burly and the younger sister is cunning, so I felt quite frightened." - Shop owner

Due to the sudden marriage of the First Prince, a dispute has broken out between the Second and Third Princes over the throne in that country. Nobles belonging to factions continue grassroots campaigns saying "my child is the best," and the princes have come to hate each other and no longer even meet face to face. The major nobles have rallied behind the Second Prince, while the cleanliness-conscious populace supports the Third Prince. In such times, two girls appeared in a certain commoner district.