The single's b-side, "11 eleven," was a cover of the Cyber X (サイバー・Ｘ) song of the same name. Cyber X originally featured misono in the song when it was released in 2003, when misono was still the lead vocalist of the band day after tomorrow.
The B-side of the single "11 eleven" was a reinterpretation of the Cyber X song with the same name. At the time of its original release in 2003, Cyber X featured misono as its lead singer, and he was still an integral part of the band day after tomorrow.