Kazusa Murai is a Japanese voice actress and narrator born on December 28, 1975, in Nagoya, Aichi Prefecture, Japan. She is a graduate of the prestigious Sacred Heart University. Her career in the voice acting industry began in the mid-1990s, and she was formerly represented by Doujin-sha Production before joining the Tokyo Actor's Consumer's Cooperative Society in 1999, where she remains affiliated. Her voice is classified as that of a mezzo-soprano.

Murai has built a versatile career, bringing to life a wide array of characters across anime, video games, and foreign language dubbing. Among her many roles are several that align with the user's query. She voiced Kyoko Shitou in the 2005 anime series Ginban Kaleidoscope. She is also known for her work in the long-running children's series Tottoko Hamutarō (Hamtaro), where she voiced the character Ribon-chan across multiple installments, including Tottoko Hamutarō: Ham Ham Ham - Jya! Maboroshi no Princess, Tottoko Hamutaro: Ham Ham Paradi-chu! Hamutarō to Fushigi no Oni no Ehonto, and Tottoko Hamutarō: Hamu Hamu Land Daibōken. She also voiced Marina in the 2001 Pokémon television special Pocket Monster Crystal: Raikou Ikazuchi no Densetsu. In the series Mirmo Zibang!, she provided the voice for the character Yamane. Her other roles from the user's list include Mai Kazami in Speed Racer X, MyuMyu in the 2001 web anime Magical Play, Saki Sawanoguchi in Magic User's Club!, and Yui Narusawa in the 1997 OVA Dōkyūsei 2 Special: Sotsugyōsei.

Beyond the specific roles mentioned, Murai's career is marked by several significant and recurring parts. She is particularly well-known for her long-running portrayal of Riri-chan (often romanized as莉莉) in the Hamtaro franchise, a role that became a signature part of her career. In video games, she is prominently recognized for her role as Kaori Yae in the beloved dating sim Tokimeki Memorial 2. Her film work includes a role as a reporter in the 2002 feature film Detective Conan: The Phantom of Baker Street. Murai's talent also extends to narrating television programs and dubbing foreign films and dramas; for instance, she provided the Japanese voice for Nadia in the American Pie film series.

In 2003, Murai formed a musical unit with fellow voice actress Naoko Takano called Waffle☆ら·めーる, and they released a CD through Konami. Her work continues into the 2020s, with recent roles including Yasuko Hanadera in the 2020 anime series Healin' Good PreCure.