Tsukiko-chan is an assistant to her idol, the star Shiratama-san. She dreams, "Someday, I want to stand on stage together with her!" One day, Baikinman and Horrorman mistakenly take Tsukiko-chan to Dokin Castle, thinking she is Shiratama-san... The voice of the heroine "Tsukiko-chan" is provided by former Morning Musume member Ishii Aya. A fun story full of songs and dances that the whole family can enjoy together!