Rina Aiuchi

Rikako Kakiuchi (垣内 里佳子, Kakiuchi Rikako; born 31 July 1980), professionally known by her stage name Rina Aiuchi (愛内 里菜) and formerly known as R, is a Japanese singer, songwriter, businesswoman, fashion model, and YouTube content creator. Born in Higashiōsaka, Japan, she won the first season of the audition Super Starlight Contest, winning a recording contract with Giza Studio. Her Eurobeat-influenced debut album, Be Happy (2001) was certified Gold in Japan and spawned a top-five single, "Koi wa Thrill, Shock, Suspense," which served as the theme song to the anime series Case Closed. Aiuchi's second album Power of Words became her best-selling album. It sold over 419,000 copies nationwide and was certified Platinum in Japan.

In 2010, Kakiuchi announced her retirement from music, founding a dog clothing brand named Bon Bon Copine in September 2012. She later resumed her musical activities, appearing on several television shows in 2015 and releasing the single "Warm Prayer" in 2018 under the new stage name, R.