An iDOLM@STER Cinderella Girls character in the Cool (Blue Diamond) category. She is 13 and likes books and movies in the adventure genre.
Mutsumi is a soft-spoken girl who wants to live a true adventure. She is always eager to discover the excitements of life that she has read about in her books. Some of her more notable reads include Don Quixote and Indiana Jones. While initially rather aloof, Mutsumi gradually lets herself be a bit wilder after she obtains her first Plus form. When in idol form, she switches her side braid for loose hair with curls. She believes it is very important for idols to challenge themselves and she appears to be knowledgeable in the subjects of Japan’s history.