Kamen Rider Den-O is a Japanese tokusatsu television series that aired from 2007 to 2008. It is part of the long-running Kamen Rider franchise and follows the story of Ryotaro Nogami, a young man who becomes the titular hero. He transforms into Kamen Rider Den-O using a special belt and the power of time-traveling creatures called Imagin. The series features a unique narrative structure, with Ryotaro often assisted by various Imagin who inhabit his body. Each Imagin has its own personality and abilities, allowing for different forms of Den-O. The show combines action, comedy, and drama, appealing to a wide audience.