Nanatsumi Mizuki

 is one of the main characters of Sky Pretty Cure: An Exchange of Morals!. Mizuki is a lonely musician who hates everyone who doesn't not the art of music. She also hates being interrupted when listening to one of her songs. As she has written her own songs already, she is a bit pushy when it comes to getting back opinions about it. She has a sharp tounge and will not accept people not liking her music. She always thinks that those who don't agree with her opinion, have the wrong opinion. Her alter ego is Cure Sonic (キュアソニック), the Pretty Cure of sound waves.