Hazuki Mikage

Mikage is a girl that moves to Mizora Island during the prologue. She enrolls into Takahisa's school as a third year student, and is later revealed to be the priestess presiding over the Kamina Shrine.
Our protagonist first meets Mikage during the welcoming festival that is held for her. Though she seems like a mature (if a little air-headed) girl, the cast quickly learns that Mikage has a tendency to establish her own flow, and more often than not easily sweeps everyone around her into it. Takahisa himself also discovers that she's actually very attentive and astute, to the point where she can easily turn a conversation around by using key words from the other person's argument.