color bottle (カラーボトル) is a four-members Japanese rock band formed in 2004 in Sendai. They made their major debut in 2007 under DREAMUSIC with the mini-album Saishoku Memory. Members * Takemori Masayuki (竹森マサユキ): Vocals, Guitar * Watanabe Akira (渡辺アキラ): Guitar * Akimoto Taichi (穐元タイチ): Bass * Okawa "Z" Shinji (大川 "Z" 純司): Drums they sing The song "青い花" which is the opening theme for the anime Casshern Sins .