Miki Saotome commands the antagonistic Tsubame Group, aided by henchmen Ukon Tanaka and Sakon Suzuki. Her ambitions fixate on capturing unlicensed supernatural entities to weaponize against the Mobile Shinsengumi, the enforcement force governing human-yōkai coexistence. Determined to dismantle Kyoto’s order and destabilize the Shinsengumi’s authority, she unleashes destructive forces like summoned monsters that ravage the city.

Her schemes extend to exploiting legal loopholes in a bid to seize control of the Shinsengumi’s corporate arm, though this gambit collapses when plummeting stock values leave her burdened with its financial debts. While primarily an adversary, she reluctantly allies with the protagonists to counter existential threats, notably aiding in vanquishing a pivotal foe during the series’ climax. These alliances prove fleeting, culminating in a symbolic downfall that punctuates her arc.

Defined by her trademark Noblewoman’s Laugh and a fervent rivalry with the Shinsengumi, Miki blends calculated cunning with theatrical flair. Her maneuvers position her as a shadow rival, though her antagonism garners little acknowledgment from the Shinsengumi, who dismiss her disruptions despite their escalating severity. The narrative prioritizes her recurrent clashes with the protagonists—through brute force and bureaucratic subterfuge—over exploring her origins or deeper motives, cementing her role as an institutional foil.

Her portrayal remains anchored as a secondary antagonist within the series’ core conflict, with no narrative expansion into alternate media or backstory elaboration.