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The story takes place in the world of *Kamen Rider Build*, divided into three regions by the Sky Wall. However, enemies from the *Kamen Rider Ex-Aid* world, the Baku Sentai, have inexplicably appeared. Why are these enemies from a world they shouldn't be in? Faced with this mysterious threat and lacking any means to respond, the War Rabbit encounters a mysterious man whose body is half covered in metal. The man, who claims to be a scientist, activates a massive machine, and another world is revealed upside down in the sky above. On the other side, the *Ex-Aid* world is experiencing the same phenomenon. The world with the Sky Wall is gradually falling into the *Ex-Aid* world, and there are only 24 hours until the two worlds collide. The countdown to the end of the world has begun...! Faced with an unprecedented crisis, only those warriors can save humanity. With a scale surpassing previous works, unprecedented action scenes, and heroes from worlds that shouldn't intersect finally meeting, the mystery-laden story is about to be unraveled.