Tail of the Moon

is a Japanese shōjo manga series written and illustrated by Rinko Ueda. The series began serialization in Margaret magazine in 2002 and ran until 2007. The individual chapters have been collected into fifteen tankōbon volumes by Shueisha; the first on March 25, 2003 and the last on August 24, 2007. The series has been licensed by Viz Media for an English-language North American release as part of their Shojo Beat imprint.

Plot
The story takes place in the Tenshō Era of Japan. Usagi is a bumbling ninja-in-training in her village in southern Iga. Though she is already fifteen, she is a terrible ninja and has made no progress whatsoever. As a result, her grandfather gives her a special mission: to go to Segachi, marry Hanzō Hattori, the leader of the main branch ninja family, and bear his child. She is accompanied by Mamezo, her longtime friend, companion, and foster child. Once they arrive it becomes apparent that Hanzō has no intention of marrying anyone, and worse yet, it seems Usagi has a much more refined rival. It is clear that as Usagi spends more time with Hanzō, she is growing on him, though the fact that he is constantly bombarded with new potential brides makes Usagi self-conscious.