Y十M: Yagyuu Ninpouchou

Vow of Vengeance. Seventeenth-century Japan: A rebellion in the Aizu teritory has been brutally crushed, leaving twenty one brave warriors dead and most of the nuns of the local convent slaughtered. Now the surviving nuns have sworn to seek revenge. They turn to the greatest swordsman of the land to train them so they can kill the ones who slew the men and the other nuns.

(Source: MU)

Y十M: Yagyuu Ninpouchou was published digitally in English as The Yagyu Ninja Scrolls: Revenge of the Hori Clan by Kodansha USA from August 9, 2016 to April 11, 2017. Before that, it had seven printed volumes published by Del Rey from October 30, 2007 to October 24, 2009, before being taken over by Kodansha.