一ノ瀬 美夕

Miyu is Mio's kind older sister and a university student. She's often found at the shrine when she's not attending campus, taking care of the place and doing various work as a miko. When they were kids, Miyu used to play together with Mio, Yuuma, and Konami. She's quite fond of Yuuma, and sometimes teases him when they meet, albeit in a different way than Konami does.

She is on good terms with Nao and Aoi, who were both her upperclassmen during their high school times.