Rin Nanagase is the primary alias used by Japanese voice actress Harumi Asai for her work in adult games and anime, a common practice in the industry to separate these performances from her mainstream roles. She was born on February 15, 1972, in Aichi Prefecture, Japan. She is affiliated with the talent agency Difference.

Her career in voice acting spans several decades, with her earliest credited roles dating back to the early 2000s. Her filmography under the name Rin Nanagase, and other aliases like Kaoru Momozono and Haruka Fukai, is extensive and primarily consists of roles in adult animated series and video games. Some of her notable recurring roles include voicing Shiranui Mizuki in the 2007 series "対魔忍 アサギ" and its 2021 sequel "対魔忍不知火～好色的な奴隷奴隷～," as well as Takai Ayane in the "いっしょにきゅんきゅん" series starting in 2013. She also provided voices for multiple characters in the 2019 series "催眠性指導".

In addition to her voice work, she is recognized as an adult video actress. Her mainstream voice acting credits, performed under her birth name Harumi Asai, include roles in long-running series such as "Fruits Basket" in 2001 and "Atashin'chi" in 2002.

A specific example of her work as Rin Nanagase is the character Nagi Saotome in the 2012 original video animation adaptation of the visual novel "Tropical Kiss". In this series, Nanagase voices Nagi, who is the resort manager at Aloha and a first love interest for the protagonist.