During the Warring States era, an emperor hunted down a general and his soldiers. With nowhere else to turn, they hid in a cave beneath a mountain where a meteorite had fallen. There, they were corrupted by its evil power, and their genes mutated, transforming them into grotesque monsters. They began taking revenge on the people of the world, burning, killing, looting, and committing every imaginable atrocity. At last, they drew the attention of Heaven, which granted the prince power to transform into Dragon Armor and seal them away one by one. For reasons unknown, the box containing the seals fell into the world of Teyvat. During his travels, the protagonist was asked by Chairman Zhang of the Central System Committee to go to that world, retrieve the gene cards, seal them, and bring them back.
(All the soldiers transformed into monsters are named Gene Beasts.) The Kamen Rider in this book is the author's own creation. Updates may be a little slow, so please bear with me.
If you spot anything that needs changing, please let me know.
OK, the author wrote it very well.