In the year 2010 humans discovered ancient martian artefact which humans called "pandora box's" and then the sky wall tragedy began and the wall went across the world dividing into three nation. In the year 2018 the nations are at war each side using their kamen rider to fight, one of this kamen rider is Kyle Walker A.K.A kamen rider cross-z. During a mission he is teleported to a new world and meets team RWBY and he will fight along side his new friends against evil.
