Nana Osaki's half-sister who appears before Nana at a special "thank you" concert for Blast's fans. She lives in Osaka, her parents own an okonomiyaki shop. She is also known as '(Misato) Number Two' by Nana. Though she bares a striking similarity to her, she is unaware of her true relationship with Nana and ironically became one of her newer devoted fans. Mai has said that it is not a good idea for Nana and Misato to become too close because they share the same mother. Misato's mother abandoned Nana O when she was a child to her grandmother.