Runa Sakaki is a Japanese voice actress primarily known for her work in adult computer games and original video animation (OVA) adaptations of those games. Her career has been active from the late 1990s through the 2010s, with her voice appearing in numerous visual novel titles. Sakaki's stage name is Runa Sakaki, and it is documented that her "real identity" is another voice actress, Asagiri Koyuki, under which she also performs.

One of her earliest and most notable roles is Hikaru Kodama, which she first voiced in the 1999 PC game Night Shift Nurses and later reprised for the 2005 OVA series Night Shift Nurses: Kranke and a 2011 game sequel, Shin・Night Shift Nurses. Another significant role is Suzuran Himenohara from the visual novel and OVA series Kanojo x Kanojo x Kanojo - San Shimai to no DokiDoki Kyōdō Seikatsu. Sakaki voiced the character in the 2008 PC game and its 2009 OVA adaptation. In this series, Suzuran is depicted as a shy, bespectacled classmate who communicates through floriography, the language of flowers.

Beyond these specific roles, Sakaki's career is marked by a wide range of character performances in adult games. Some of her other credited roles include Crocodile Mouth Kibara in Shirokuma Bell Stars, Hinano Kudo in Mirai Nostalgia, and various characters in series such as Hero * Senki and Princess Party. Her filmography demonstrates frequent collaboration with studios and publishers in the adult gaming industry, though specific recurring creative partnerships with individual directors or companies are not detailed in the available records. Her work is characterized by a focus on voice acting for bishōjo games and their associated animated adaptations.