Age: 20s
Profession: Detective
Weapon: Hidden dagger

Ostensibly a young courtesan employed in a brothel, Yatsuha is actually Otawa's partner, working to stop the brothel's counterfeiting operation. When she's discovered shortly after meeting Mugen, she tries to escape, but an oblivious Mugen insists on getting the services he paid for and kills her would-be assassins. Despite several attempts at either convincing Mugen to leave or knocking him out (first with a hit to the head and the second in the groin, both precipitated by the claim "Look! A naked woman!"), she is unable to rid herself of him. As such, she uses the promise of sex to manipulate into fighting for her. They invade the brothel's basement and slaughter several people. Yatsuha then murders Ginsa, leader of the counterfeiting operation because of his history with her father and knocks Mugen unconscious so she doesn't have to fulfil her promise. The next morning, she confesses to Otawa that she is in love with Mugen and intends to marry him. Otawa has reservations about her taste in men.