V-------V G-----------PG----------PG13-----------R------NC17Why: V+, AS, N
It is feudal Japan and a samurai named Jubei Kibagami gets involved with some nasty persons.
The Eight Devils of Kimon, to be specific, who want to overthrow the government. The leader of the Eight Devils wants to set himself up as the new Shogun of the Dark and each of the members of the Eight Devils has rather intense mystic abilities. All of them are trouble for Jubei, a pretty female ninja named Kagero and government "spy" named Dakuan.
Ninja Scroll does not have a deep story, and is fairly adult in a couple of places and is very violent. However, if you enjoyed Curse of the Undead: Yoma or The Dagger of Kamui, then you might like Ninja Scroll.