
Quick answer — Mayu Sagara voices Kasumi Nakasu in Love Live! Nijigasaki High School Idol Club, Ayaka Mizusawa in PuraOre! ~Pride of Orange~, Luceria in A Nobody's Way Up to an Exploration Hero and 10 more characters.
Mayu Sagara voices Kasumi Nakasu (Love Live! Nijigasaki High School Idol Club), Ayaka Mizusawa (PuraOre! ~Pride of Orange~), Luceria (A Nobody's Way Up to an Exploration Hero), Ume Toranomon (Aru Asa Dummy Head Mic ni Natteita Ore-kun no Jinsei), Haruna Amaori (There's No Freaking Way I'll Be Your Lover! Unless…), Kisekien no Kodomo (Tying the Knot with an Amagami Sister), Michiru Yano (Kaya-chan Isn't Scary), Sara (Catch Me at the Ballpark!) and 5 more.
Kasumi Nakasu is voiced in Japanese by Mayu Sagara.