Tsubaki, a raven-haired swordswoman from Yapan, journeys to Norland during Cain Asbell’s rise as lord and confronts him in a duel. Though inexperienced, Cain studies her duel against the "Mysterious Masked Warrior"—later revealed as Princess Charlotte—and adapts her techniques to defeat her. Tsubaki then dedicates her expertise to Norland as its arms trainer and strategist, employing her combat mastery to safeguard the realm. Her tactics prove vital in repelling Tedmond’s forces from the Wood of the Dwarves and coordinating citizen evacuations during sieges. When Cain ascends to kingship, she assumes command as Captain of the Guard.

Her past is marked by Bagwell, a warrior who slew her father in a duel, seized their dojo, and took Tsubaki hostage before raping and murdering her mother. This trauma fuels her thirst for vengeance. During Tedmond’s campaign for the Dwarven Woodlands, she confronts Bagwell in single combat, slaying him to secure Norland’s victory and avenge her family, cementing her allegiance to Cain’s cause.

Initially driven by personal redemption, Tsubaki evolves into a disciplined leader focused on communal defense. Her strategic innovations during Tedmond’s assaults underscore her adaptability and unwavering loyalty to Cain. Despite entering Norland as an outsider, her relentless skill and dedication earn her a trusted place within its hierarchy.