Kamen Rider Decade (仮面ライダーディケイド, Kamen Raidā Dikeido) is a Japanese tokusatsu series that serves as the 19th installment in the Kamen Rider franchise and the 10th entry in the Heisei era. These characters exist amongst various iterations of reality within the series referred to as an A.R. World (Another Rider's/Alternate Reality World).