Aki Okui is a Japanese singer-songwriter born on October 19, 1971, in Itami City, Hyogo Prefecture. She debuted with the single "Gin no Supūn de" on November 28, 1993, under Warner Music Japan. Okui gained prominence by contributing theme songs to various anime series, including Magical Circle Guruguru (1994-1995), Crayon Shin-chan (1996), and ∀ Gundam (2000). Throughout her career, Okui has transitioned between major labels and indie scenes. In 2003, she shifted her focus to the indie scene and formed a limited-time unit called "Fukumusume" with Miyako Shinohara, releasing the mini-album Natsu no Hana (2003). She also released a self-cover best album titled COCOROTO (2003) to celebrate her 10th anniversary as a singer. Okui continued to contribute theme songs to popular anime series such as Pokémon Best Wishes (2010), Yūgiri Akari × Amnesia (2012), and Mekakucity Actors (2014). In 2025, she released her new album Fūmuki featuring 12 previously unreleased tracks arranged and produced by Tomohiko Gondou.
