Yuki Nagaku is a Japanese voice actress and singer affiliated with the talent agency Aoni Production. She was born on April 8, 1990, in Hyogo Prefecture, Japan, and stands 166.5 cm tall. Nagaku began her career after graduating from the Aoni Juku Osaka school, where she was part of the 28th graduating class alongside fellow voice actresses Naomi Ozora and Erika Tanaka.

Nagaku made her debut as a voice actress in 2014, with one of her earliest roles being Aki in the television anime Medamayaki no Kimi Itsu Tsubusu?. A significant turning point in her career came in 2015 when she was cast as Miku Shigemoto in the series Sore ga Seiyu! (That Is a Voice Actor!). For this series, she formed the voice actress singing unit Earphones alongside her co-stars Rie Takahashi and Marika Kono. The group made their musical debut in June 2015 with the single Ear no Naka e, launching her career as a singer as well.

Over the following years, Nagaku built a diverse portfolio of anime voice roles. Her notable television anime credits include Arisa Ahokainen in Akiba’s Trip: The Animation (2017), Yukana Yame in Hajimete no Gal (My First Girlfriend is a Gal) in 2017, and Ena in the 2017 series of Mahōjin Guru Guru (Magical Circle Guru Guru). In 2016, she joined the cast of the third season of Pretty Guardian Sailor Moon Crystal, providing the voice for Mimete, a member of the Witches 5 antagonist group.

In 2019, Nagaku took on several prominent roles. She voiced Lily Earhart in Tatsunoko Production’s original anniversary anime Egao no Daika (The Price of Smiles), a supporting character described as a cheerful and supportive member of an imperial military squad. That same year, she voiced the title role of Aoi Musashino in the short anime film Tatakae! Space Attendant Aoi, which was produced as part of the Anime Tamago project. Her work on this film also tied into her music career, as Earphones performed the song Churatachuraha for its animated music video. Another significant role from this period was Aurora in the romantic comedy series Tonikaku Kawaii (TONIKAWA: Over The Moon For You).

Beyond her voice acting in anime, Nagaku has contributed to video games such as Ys VIII: Lacrimosa of Dana and has been active in radio broadcasting, hosting several programs from 2016 onward. Her career reflects a steady presence in the industry, with recurring collaborations particularly evident through her continued work with her Earphones colleagues.