"Tsumetai Hana" () is the Brilliant Green's fourth single, released on August 26, 1998, by Sony Music Records, and reissued on October 1, 2000, by Defstar Records. It peaked at #1 on the Oricon Singles Chart, and was the band's second #1 single. It was used as the opening theme for Count Down TV.
The song also appears on the band's compilation albums, Complete Single Collection '97âÂÂ'08 (2008) and The Swingin' Sixties (2014).