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.
First, thou must fondle thy breasts 
to promote hormone excretion!
Zuerst muss man seine eigenen Brüste kneten
und die Absonderung der Hormone fördern!
Primero debes tocarte los pechos
Primero debes tocarte las tetas
Règle nº 1 : Masse ta poitrine
pour stimuler la sécrétion d’hormones.
Primeiro, você deve acariciar seus seios
para promover a produção de hormônios!
Первый! Перси свои надлежит нежить,
дабы усилить выработку гормона!