It is a typical day in the life of actor Kazuki Shimizu when a gun is found inside his bag, leading to all sorts of trouble for him. A Day of One Hero is a direct-to-video film starring Kazuki Shimizu as himself in a mockumentary of his acting career as Don "Doc" Dogoier in the Super Sentai series Kaizoku Sentai Gokaiger. The film also features cameo appearances by Tokusatsu veteran actors Yoshio Yamaguchi and Nao Nagasawa.