Born in Higashiōsaka, Japan, she won the first season of the audition Super Starlight Contest, winning a recording contract with Giza Studio.

[1] Her eurobeat-sounding 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 Japanese anime television series Case Closed.

She later resumed her musical activities, appearing on several television shows in 2015 and releasing a single "Warm Prayer" in 2018 under the new stage name, R.[3] Kakiuchi was born on 31 July 1980, in Higashiōsaka, Osaka.

In July 1998, Kakiuchi's cover of "Desperado" by Nathalie Aarts was released as a part of the euro-beat compilation album Eurobeat Flash Vol.19, via Cutting Edge.

[4] In the spring of 1999, she won the first season of the audition show Super Starlight Contest and received a recording contract with Giza Studio.

[1] In March 2000, Kakiuchi made her debut as Rina Aiuchi with her first single "Close to Your Heart", the theme song to the Japanese animated television series Monster Rancher.

Her fourth single "Koi wa Thrill, Shock, Suspense" achieved nationwide success, reaching number five, selling over 100,000 copies.

[11] Power of Words achieved a massive success in Japan, topping on the Oricon chart and certificated Platinum by RIAJ.

The single has sold approximately 82,000 copies in Japan and been certificated Gold by RIAJ, peaking at number four on the Oricon chart.

The follow-up single, "Kaze no nai Umi de Dakishimete" served as the theme song to the Japanese drama Tsuribaka Nisshi.

The fourth single from the album, "Full Jump" was released to a success, peaking at number three on the Oricon chart and certificated Gold by RIAJ.

The song was written for the Japanese television animated series Case Closed and sold approximately 30,000 copies in Japan.

In addition to her work for Delight, Aiuchi appeared on the track "Ai Epilogue" on Tsunku's album Type 2.

[17] In April 2007, the second single as Rina Aiuchi and U-ka Saegusa, "Nanatsu no Umi wo Wataru Kaze no yō ni" was released to a commercial success, selling over 36,500 copies in Japan.

The song was written for the Japanese animated movie Detective Conan: Jolly Roger in the Deep Azure.

The album succeeded commercially, reaching number seven on the Oricon chart and selling over 38,000 copies in Japan.

On 30 July 2010, Aiuchi announced that she would retire from the music industry at the end of the year, because of the thyroid deficiency.

[21] In September 2015, Aiuchi appeared on the Japanese television music show, The Karaoke Battle and covered "Hello, Again (Mukashi Kara Aru Basho)" by My Little Lover and "Love Story" by Namie Amuro.

On October 13, 2022, Osaka District Court dismissed Aiuchi's lawsuit, ruled that the harassment is not recognized; her appeal at Osaka High Court rejected on April 21, 2023, ruled that her sexual harassment claim is not credible.