Manyū Hiken-chō

Manyū Hiken-chō (魔乳秘剣帖, lit. "Magic Breast Secret Scroll") is a Japanese manga series written and illustrated by Hideki Yamada. Set in a parallel version of the Taihei Edo period, the series follows the busty kunoichi, Chifusa. The manga began serialization in Enterbrain's seinen manga magazine Tech Gian in 2005. An anime adaptation produced by Hoods Entertainment began airing in Japan in July 2011.

Plot
In a reign ruled by the Tokugawa shogunate, 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 ruling Manyū 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. However, she takes the secret scroll and runs away with it, hoping to fight against the cruel world that the Manyū Clan has created.