Kagami is 16-years-old, the second eldest of the Yagami sisters, and is Sasami's classmate. She is a plain girl and is constantly sleepy. She is a cyborg created from a part of Amaterasu who has a vast arsenal of magic and high-tech weapons hidden all over her body. Her name is based on Yata no Kagami.
Voiced by: Kana Hanazawa.