Benben and Yatsuhashi Tsukumo, also known as the Tsukumo Sisters, are the stage four bosses from Touhou Double Dealing Character. They are both musical instrument tsukumogamis, a biwa and a koto respectively, that came to life because of Shinmyoumaru's wish. The sisters reappear in the extra stage after making a deal with Raiko Horikawa to trade in their life source for a more permanent one.