Tail of the moon - Rinko Ueda

Usagi is the granddaughter of the leader of a presitgious ninja village, but she's such a klutz that she's never made it out of the kiddie class. Frustrated with Usagi's lack of progress, her grandfather sends her to marry Lord Hanzo and have lots of ninja babies. But the lord has no interest in her or her childbearing potential!

Usagi's mission to bear Hanzo's child is not going well. The father of her future babies has no interest in her, and she has a beautiful, brilliant rival. In order to regroup, Usagi goes back to her home village, arriving just in time for the annual Ninja Games - and the prize is a love potion! In order to win the race Usagi agrees to team up with her ex-fianc Goemon...and then Hanzo drops by the village unannounced! Who will win in this game of love?