This highly unrealistic manga takes place during the Shogunate. There are two clans of ninja, the Iga and the Kouga, and they hate each other, even (or possibly because) they live near each other. The Shogun decides that he will have the Iga and Kouga battle each other to the death in order to determine which of his sons will succeed him. Most of the Iga and Kouga are excited, or at least accepting of this idea, because they’ve been itching to slaughter each other. But Gennousuke and Oboro, the young heirs to their respective clans, are in love, and angst over this. Anyway, so there are ten super-powered ninjas on each side, and within the course of several volumes, the rocks are falling and people are dying. The author manages to create a lot of suspense even though it’s just continual ninjas flipping out and killing people, especially since there’s an interest in seeing how they’ll exploit their special abilities, and most importantly, their opponents’ ignorance of them, in order to cross off another name on the list.