
Quick answer — Satomi Hanamura voices Mirai Onozawa in Tokyo Magnitude 8.0, Kanae Sumida in 5 Centimeters per Second, Miki Kataoka in Windy Tales and 4 more characters.
Satomi Hanamura voices Mirai Onozawa (Tokyo Magnitude 8.0), Kanae Sumida (5 Centimeters per Second), Miki Kataoka (Windy Tales), Aya Okamura (Dareka no Manazashi), Ayano Kinugawa (School Rumble 2nd Term), Yoriko Endou (Uzumaki), Lisa Livington (The Reflection).
Mirai Onozawa is voiced in Japanese by Satomi Hanamura.