Born on December 13, 1972 in Tottori, Kumatani started playing the piano from the age of just three, after begging her mother to give her lessons. Having developed a love for music, she started to compose while growing up and pursued music further at junior college. After graduating, she joined Sega in 1995. Soon enough, she reflected her individuality by offering immersive fusions of electronic and acoustic forces with several tracks on NiGHTS into Dreams. She subsequently contributed to Neon Genesis Evangelion Digital Card Library, Burning Rangers, and Let’s Make a Pro Baseball Team.