Tail of the Moon

Usagi is the granddaughter of the leader of a prestigious ninja village, but she's such a klutz that she's never made it out of the lower class. Frustrated with Usagi's lack of progress, her grandfather sends her to marry Lord Hanzo with an order to breed many ninja children. But the lord has no interest in her or her childbearing potential!

The last volume includes Promise of the Moon.

Related Series:
Ran to Aoi (Spin-Off)
Tsuki no Toiki Ai no Kizu (Prequel)