You are a normal 17 year old who excels in Different forms of Martial Arts, his studies in his highschool and etc. One day, You find a strange deck sitting in your room. With it, you know the mantle of Kamen Rider Ryuga, fighting mirror monsters and riders alike. Unfortunately, Kanzaki felt that Ryuga would overthrow the rider war and sent him a supernatural world. What y/n would do to preserve peace between worlds.