As a child, Nagi was found without any memories outside of Tsukigata Village by Geirin, who named her and took her in as his disciple.[2] She is a logical person who deeply admires her mentor and tries to imitate his speech and behavior. Nagi is initially standoffish towards Raidou, who she views as intruding on the territory assigned to her mentor by the Yatagarasu, but she eventually comes to respect him and relies on his advice.