Yūka Kotorii is a pseudonym used by the Japanese voice actress Natsumi Takamori for her work in adult video games. Under her primary name, Natsumi Takamori, she has built an extensive career in mainstream anime and video games.

Born on February 14, 1987, in Yamanashi Prefecture, Takamori began her voice acting career in 2009 and is currently affiliated with the agency Raccoon Dog. She is known for a wide range of major anime roles. Some of her most notable performances include the enigmatic Mei Misaki in the horror series Another, the stoic student council president Sona Sitri in High School D×D, and the idol Miku Maekawa in The Idolmaster Cinderella Girls. Other prominent roles include Misaki Kamiigusa in The Pet Girl of Sakurasou, Nikka Edvardine Katajainen in Brave Witches, and Raiha Uesugi in The Quintessential Quintuplets.

As Yūka Kotorii, she has voiced numerous characters in visual novels, often taking on lead or supporting heroine roles. The VNDB database lists her under this alias for a vast number of titles. A specific example of her work under this name is the role of Mirei Masaki in the 2018 visual novel Otome wa Boku ni Koishiteru: Trinkle Stars, the third game in the Otome wa Boku ni Koishiteru series. Her filmography under the Kotorii name is extensive, with credits including Patricia of End in Nora to Oujo to Noraneko Heart, Saki Inui in Ao no Kanata no Four Rhythm, and Wakana Kariya in Sanoba Witch, among many others.