Manyu Scroll

In a world where large breasts are crucial, Chifusa Manyu, heir of the Manyu family, flees with their secret enlargement techniques. Attacked by her sister Kagefusa, Chifusa discovers her ability to transfer breast size and embarks on a journey with comrade Kaede.

Chifusa and Kaede, needing funds, encounter a landlady/Manyu assassin who tries to enslave them. Chifusa uses her Breast Flow technique to defeat her, gaining insights into this power and vowing to restore Kaede's breasts.

Starving, Chifusa and Kaede work at a maid bar, get fired, and help a man in a contest to appease a landlord. Chifusa wins despite Manyu attacks and impresses the landlord, who becomes infatuated with her.

Chifusa and Kaede turn divers to pay a food bill. Chifusa rescues Oiso from an octopus using her Breast Flow technique, which alters Oiso's breast size. Oiso then kills the octopus, thanking Chifusa.

Chifusa and Kaede save Osuzu from assault and help her win over Yasuke, a widower. They also deal with Yasuke's children, who miss their mother's breasts, promising them not to harass women after a unique deal.

Chifusa's enlarged breasts hinder her. At a temple, a nun links her powers to maternal longing. Kagefusa steals the Manyu scroll but can't use it. Moved by Chifusa's kindness, she returns it, promising to learn the Breast Flow technique.