Blood type: A

Birth place: Ibaraki Prefecture, Japan

Masumi Itou is a singer and composer. Itou has composed the soundtracks to many anime television shows and is part of the bands Oranges & Lemons and Heart of Air. She graduated from Musashino College of Music, and her husband is Yoshiyuki Itou, head music producer at Lantis.

She often composes soundtracks under the pseudonym Hikaru Nanase (七瀬 光). Her maiden name is Masumi Nitta (新田 真澄).