fivepiececrossgenrerockband BACK-ON and FLOW release new collab! ‘TV size’ short version of ‘KAMEN RIDER GOTCHARD’ opening theme song ‘CHEMY×STORY’ out now 8 months ago Performed by Japanese rock band BACK-ON, 'CHEMY×STORY' is the opening theme song to 'KAMEN RIDER GOTCHARD'. At a press…