Tsunagi is a girl who appears to be the same age as Risuka and Kizutaka, but is actually over 2000 years old, having been transformed into a Mage by Risuka's father. She is the founder of the Gate Management Committee, which has regulated travel in and out of Nagasaki Prefecture, but has been working as the leader of an isolated frontline unit. Although she is experienced and reliable, she is poor at dealing with unfavorable circumstances.