Natsu no Yon

Originally serving the Ashikaga clan, she is known by the pseudonym "Natsu no Yon." She wields a wooden prosthetic arm and mask, using "tengu body" techniques made from beast tendons, and behaves as an adult. While she has absolute confidence in her skills, her overly serious nature and lack of adaptability are her flaws.

As the leader of the tengu group, she infiltrates Shinano to monitor the Suwa family, but fails to prevent the outbreak of the Nakasenada Rebellion. She gets outmaneuvered by Genba and Tokitsugu, ultimately becoming a captive, though she later escapes. Attempting to redeem her mistake, she continues to pursue Tokiyuki after the rebellion, aiming for his life, but is discovered by Genba and placed under his surveillance.