Chitose`s younger sister, not a blood relative. They met each other while at the orphanage.
Minazuki also known as just plain Mina, currently lives with her older sister Hazuki in an apartment a few blocks away from Chitose. She is a cheerful and optomistic girl who has secretly loves Chitose, even though they are family. Upon finding Chitose and discovering his five mothers, her dream of living with a big family has come true. The mothers accept her as their own daughter and which leads to some comical adventures.