Nagi shares a deep-rooted bond with the protagonists as their childhood companion from the same orphanage. Unlike her peers, who acquired supernatural Links and abilities after an unexplained Tokyo-wide blackout, she remains an ordinary human devoid of such powers. Her significance lies in her grounded humanity, contrasting the superhuman dynamics shaping her friends’ survival and societal standing. The story positions her as an emotional anchor, navigating a reality where strength is often measured by extraordinary gifts she inherently lacks.