Has a similar premise; taking Kamen Rider characters, rendering them super-deformed, and placing them in all manner of wacky hijinks. Focuses on the ten Showa Riders rather than the Imagins of Den-O, although a few (Amazon, Stronger, #2, Shin) are limited to cameos. However, KRSD is one long episode as opposed to several short ones, and has much better animation (despite looking very '90s in terms of art style).
Old but absolutely hilarious re-imagination of your even older favorite classic show. Forget about story (it's a comedy), forget about beautiful graphics (there is none) - just flip off your brain switch from "Serious" to "Silly" and you can enjoy the show to the fullest!