Youtube. Manyū Hiken-chō (魔乳秘剣帖, lit."Magic Breast Secret Sword 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 Chifusa, a busty kunoichi learning to be samurai.The manga began serialization in Enterbrain's seinen manga magazine Tech Gian in 2005.