Oyuki, a cunning ninja serving as Tenkai’s agent, hunts the protagonist under the monk’s orders, deploying combat skills marked by illusory duplicates to overwhelm foes. Her early clashes center on eliminating the target, but a voyage to America shifts her path when the protagonist spares her after a duel, sparking a fractured loyalty.

Unbeknownst to both, she shares a father with the protagonist, a truth Tenkai weaponizes during a later confrontation to fracture her resolve. This revelation intertwines her duty as a ninja with buried kinship, complicating her allegiance.

Her arc crescendos when she impales Tenkai over a concealed treasure, defying him to protect her newfound sibling. Yet his retaliatory strike proves fatal, sealing her fate. Her death—a fleeting moment of agency amid lifelong manipulation—fuels the protagonist’s vengeful crusade.

Clad in a floral-patterned short kimono atypical for ninja, she wields a reverse-gripped dagger, emblematic of her fluid loyalties. Stealth and illusions define her tactics, while her journey dissects identity, loyalty, and the corrosive weight of political machinations.