Accidentally transported to Earth, this world allows the discovery of past life memories and the inheritance of past abilities through special means. Jiang Lan discovers that his first life was Kamen Rider Kuuga! Later, he became Ryuki, Kabuto, Decade, and other Kamen Riders, causing a global sensation! Seeing Jiang Lan transform into Ultimate Kuuga atop a snow-capped mountain to battle Daguba; seeing him sacrifice himself to protect others from the monsters of the Mirror World, dying in his friend's arms; seeing him unleash a passionate massacre with the Purple Lantern to ensure the continuation of the Riders' stories! Countless people were moved! "Jiang Lan has reincarnated countless times, silently protecting humanity and Earth!" "I can't imagine what Earth would be like without Jiang Lan!" "Beneath his mask, he's just flesh and blood!" Having his past life memories exposed, Jiang Lan also gained all the abilities of his previous life! One day, a tokusatsu (special effects) show invades reality! Jiang Lan silently pulls out a large gold watch, becoming a supreme and powerful Demon King…