Misora Hibiki is the heroine of the series. After fusing with Harp, she is referred to by the name Harp Note. She is a popular rock star singer, but is not good at making her own music, so all of what she sings is written by other people. However, after meeting Harp, she began to try her best to make her own music. Misora then met Subaru and decide to stay by his side to fight other FMs.

Misora is seen as a potential love interest for Subaru - who is quite oblivious to all of it. War-rock enjoys teasing Subaru about this but all he does is blush and tells him they are just friends. It is unknown whether Subaru has feelings for her.