|Season||Guardian Angels Of The Sky|
Nagisa is a childhood friend of Akbayasahi Rubi and her sister Robin. When they were younger, the three were known to spend much time with each other. However, when the girls transferred into middle school, Nagisa enrolled to a far away private academy for talented artists. Since then, the girls have not been able to spend much time anymore. As of summer 2015, Nagisa's family may also move away from Hisakata...
Sumeragi (皇?) - Sumeragi is a Japanese word which literally means "emperor".
Nagisa (なぎさ?) - Nagisa is a Japanese given name for girls, whose meaning differs. The name could come from 渚 ("beach" or "shore"?), from 汀 ("water edge" or "shore"?) or it could come from 凪砂 ("lull sand"?).