Kamen Rider 555 is a Japanese tokusatsu series that aired from 2003 to 2004. It is the 13th installment in the long-running Kamen Rider franchise. The story follows Takumi Inui, a young man who becomes the titular hero, Kamen Rider 555, to battle against the Orphnoch, a race of human-like monsters. The series explores themes of identity and humanity, as Takumi struggles with his own past and the nature of the Orphnoch. With the help of his allies, including Mari Sonoda and Masato Kusaka, he fights to protect humanity while uncovering the truth behind the Orphnoch's existence.