In this world tits means everything. It is currently the peaceful Edo-Era. It is a reign ruled by the shogunate . Inside this shogunate, there is a group of warriors that support the government. They are the Manyuu Clan ,who has the authority to control the qualifaction and bring most of the big tits .
In this current era, breasts mean everything. If you have breasts, you are guaranteed wealth and popularity. If you lack them, you are rarely considered “human”. Members of the Manyuu Clan help raise the future big breasts. Written on a secret scroll possessed by the clan, there is said to be various techniques on how to grow big and beautiful breasts.
Chifusa is to be successor of the clan. She was chosen mainly because she has an innate ability to take other women breast by magically slicing them ,transfering their breast girth to her own breast.(This anime doesn't show mutilated breast .The breast shrink with flashy effects when their sliced in this anime.). However, she takes the secret scroll and runs away with it, hoping to fight against the cruel world that the Manyuu Clan has created .