This is a spin-off mini-game of Sengoku Rance , featuring Suzume, Kanami, and Princess Sen.

Suzume's past comes back to haunt Kanami as a Silver Eye Sect ninja named Kakusui steals Kanami's Decapitation Blade and plans to get revenge on Suzume and Inukai over the death of her leader, Gumo Danjou by using its abilities to become stronger than Suzume. The chase is on, as Kanami, Suzume and Senhime work together in order to get Kanami back her Decapitation Blade.

[From AliceSoft Wiki]