Kamen Rider Den-O Season 1 Episode 4 Episode 4 ( Air Date 2007-02-18 ) Genre Drama, Sci-Fi & Fantasy, Action & Adventure, Kids category. Overview "Ryotaro Nogami transforms into Kamen Rider Den-O traveling to different times using the time-traveling train DenLiner to battle the Imagin monsters and preventing them from altering the past to affect the present and future.".