Ling Yu and his younger sister, Ling Xi, accidentally touched the dimensional plasma collider their mother had left behind. They were sucked into another universe and landed aboard a spaceship built from Minecraft blocks.
The siblings both reverted to childhood, their minds regressing in sync with their bodies. Their sister even took it upon herself to give them new names: Kleinal and Clara.
Their transmigration came with a bonus Rider starter pack. Kleinal had a large collection of Heisei and Reiwa primary Rider Drivers, half of a Zi-O II Ridewatch, and White Woz's Future Notebook. Clara got matching secondary Rider gear, allowing her to transform into Kamen Rider Geiz. But danger followed them like a shadow. Every time Kleinal transformed into Zi-O, the Himeko family's inherited erosion curse quietly ate away at his body.
A sudden cross-dimensional chat group bound itself to Kleinal. Its absurd name was “Kiana's Harem Group,” and its members were beautiful girls from various worlds.
The newcomer, codenamed “Little Demon King,” played on Zi-O jokes by claiming he was “starting a Demon King business.” Yet in his heart lurked the grim future of Oma Zi-O and Zi-O Oma, while fan-made, modified Zi-O forms kept swirling through his mind.
The blocky spaceship headed for the Xianzhou Luofu, where Kleinal hoped to find a doctor who could fight the curse. On one side were the power of Kamen Rider and the shadow of the Day of Oma Zi-O; on the other was a lively cross-dimensional group chat.
The Demon King's entrepreneurial journey began.
