Sakamoto's Ninja Universe

The era when Samurai and Ninja existed in Japan. Rikka Isurugi was born and raised in a Ninja clan secluded from society. She soon meets Miya, a girl with a mysterious power, who is found lost in the mountains. As Rikka is concerned that someone is pursuing Miya, she also asks the head the of Isurugi Ninja Clan for permission to avenger her father's death. Soon Rikka faces danger with the attack of the Negoro group but…

Rikka is a ninja descendant. Her grandfather Hyoe is the last chief of their ninja clan and her father is a cyborg researcher. Both are killed when a weapons' company raids his lab to use his research. Rikka sets out to avenge their deaths.

The descendants of the legendary Fuma ninja clan face off against the Tokugawa shogun's family of Yagyu samurai as they kidnap women in the hopes of finding a concubine for the shogun

Rikka Isurugi (Chihiro Yamamoto), head of the Fox Clan, is investigating the "White Lotus," a mysterious cult suspected of plotting a rebellion against the Shogunate. During her mission, she encounters Okyo (Kanon Miyahara), a Fuma Ninja dispatched by the Shogun. Their paths converge as they face a formidable common enemy: the Iga Ninja clan, led by Hattori Hanzo (Kane Kosugi), who harbors a deep vengeance against the Tokugawa family. A three-way conflict between the Fox Clan, Fuma Ninja, and Iga Ninja is about to begin.