Haruka Fukai is a Japanese voice actor primarily known for her work in adult animation and video games. Information about her career is closely linked with the alias Nanase Rin, a name under which she has performed in numerous roles. Fukai is recognized for her distinctive ability to portray mature female characters, often employing a husky and sensual vocal quality. Her physique, notably strong vocal cords, is said to allow her to endure long recording sessions without her throat becoming dry.

Her extensive filmography is populated with a wide array of roles, predominantly in PC games and original video animations. Many of these performances are credited under the Nanase Rin pseudonym. Examples of her work include playing Saori Mikkachi in After... The Animation, Ryoka Fuwa in Cosplay Cafe, and Himeno in Kyūketsuki. She also voiced Ayaka in T&A Teacher, Akiko Kawai in Saimin Ryōjoku Gakuen, and Mizuho in Stringendo - Angel-tachi no Private Lesson. Her credits further include the roles of Haruka Mizuhara in Rape! Rape! Rape!, Misako Takakura in Dream Note, Reina Morimoto in DISCIPLINE Zero, and Yuka in Renzu.

Beyond these specific titles, Fukai's body of work as Nanase Rin demonstrates recurring collaborations with specific software houses and involvement in long-running series. She took on the role of Sylvia Vesper in both Magical Witch Academy and Dungeon Crusaders 2. In the world of erotic gaming, she performed as several characters across the D-spray series of games and contributed to major titles such as the expansive visual drama of the Shin Koihime Musume franchise, where she voiced the character of Kakouton (Xiahou Dun). Her career, as documented through her roles, spans from at least the early 2000s to the mid-2010s, with consistent activity in the industry. Her performances in titles such as DISCIPLINE Zero, the sequel to a well-known series in the genre, and as Mizuho in Stringendo represent some of her notable contributions to character-driven adult narratives.