Tail of the Moon volume 4 features story and art by Rinko Ueda.

Usagi will remain in Ieyasu's household forever, apart from her beloved Hanzo, unless she can come up with an elixir of eternal youth for Ieyasu. Banding together with Goemon, Yukimaru, Yuri, and Mamezo, Usagi journeys to a mountain to find a hermit who supposedly knows how to create such an elixir.

Although a ninja in his youth, the hermit has no intention of sharing his knowledge with Usagi or her companions. Even if Usagi is successful in changing the hermit's mind, there are others who don't want to see her free to return to Hanzo's arms...