Natsuko Yanagisawa is a supporting character in the anime Nazotokine. She is a woman with pink or red hair and orange eyes who works at the talent agency TEN2, having obtained her position through personal connections after a previous career as a cabaret hostess. Her true identity is Tokuyo Nazo, and she is, like the protagonist Tokine Amino, one of the few humans able to use her full cognitive abilities when transported to the alternate dimension Quizzun. In this realm, she competes directly with Tokine to solve puzzles, matching her rival’s speed and skill. Her motivation appears to be the acquisition of Q-stones, the energy released by the pleasure of solving riddles, and she pursues this goal with determination. Her key relationship is that of a rival to Tokine, though both operate within the same workplace in the real world. Over the course of the story, she is introduced as a mysterious figure who gradually reveals her capabilities, showing herself to be a capable and quick-thinking puzzle solver in her own right. Her notable ability is the same enhanced mental function that Tokine possesses, allowing her to move, speak, and reason freely within Quizzun while others remain incapacitated.