Chifusa und Kaede erreichen das Dorf Munamori. Dort begegnen sie Obaba und Tsuyuha, die Chifusa das Geheimnis der Busenströmung beibringen können.
Chifusa and Kaede arrive to the Munemori village, hometown to Chifusa's mother, which is now in ruin. There they reunite with Chifusa's grandmother and Chifusa's aunt, Tsuhuya Munemori, and her baby daughter, Hazuki. Tsuhuya agrees to teach Chifusa how to master the Breast Flow technique. At the same time, Kagefusa and Kokage take Ouka to Edo village, where they have a day of fun and a night of drinking, during which Kagefusa and Ouka discuss the latter's feelings for Muneyuki until they are interrupted by a courier with urgent news. The following day, before the training begins, Chifusa's grandmother tells Chifusa the story of how her mother died, revealing that Chifusa's mother killed herself so the Manyu wouldn't learn how to use the Breast Flow technique for their corrupt ways. Nonetheless, Chifusa vows to learn the Breast Flow technique in order to undo the Manyu's unjust regime.
ついに胸杜の里にたどり着いた千房と楓。そこにはかつて母の千組とともに暮らしたおばば、そして桃葉の姉、露葉の姿があった。ふたりに乳流れの奥義を伝授してほしいと頼んだ千房は、いままで知らされることのなかった亡き母の想いを知ることに。一方、そのころ、胸幸や桜花を始めとした魔乳の精鋭たちも胸杜の里に迫っていた……。
Chifusa et Kaede arrivent au village de Munamori, le village natal de la mère de Chifusa. Ce dernier est aujourd'hui en ruines, mais elles y retrouvent la grand-mère et la tante de Chifusa, Tsuhuya et Hazuki. Tsuhuya accepte alors d'enseigner à notre héroïne le flux des seins.
Tras mucho esfuerzo, Chifusa y Kaede consiguen llegar a Munamori, el pueblo de su difunta madre. Allí conocerá la verdad sobre el clan y el Chichi-Nagare.
