"Oka o Koete" marked a shift towards a more mature sound for Koizumi, moving away from the upbeat synth-pop of her earlier career. The single showcased her evolving artistic direction in 1990.
- "Oka o Koete" was released on September 21, 1990, by Victor Entertainment.
- The single features a B-side titled "Sono ki ni sasenaide."
- The song was written by Yoko Aki and composed by Kyohei Tsutsumi, a frequent collaborator of Koizumi's.
Kyōko Koizumi is a Japanese pop singer and actress from Kanagawa Prefecture, best known for her work in the 1980s and 1990s. In 1990, she was a prominent figure in the Japanese music scene, having already established a successful solo career.
Tracklist
