Not-yet seventeen years old, Yamabuki, the only surviving daughter of a legendary warlord, travels in the guise of an ordinary samurai, heading for the capital carrying secret dispatches in her first real-world test. Having triumphed in a battle with a sword master, she finds herself waylaid in a lawless town, her path blocked by unseasonable snows, and her safety at risk from the corrupt sakimori.
Meanwhile, rival factions in her home province send a master ninja to make sure she never reaches her destination alive.
But all is not darkness. Yamabuki also encounters the young warlord Yoshinaka, handsome and charismatic, who vows to reclaim his birthright from his treacherous uncle.
Drawn to him as a kindred soul, Yamabuki starts to open her heart. But does she want to get entangled in his ambitious plans to conquer and rule over the entire empire?