Kamen Rider Drag-Onyx x Rise of the Shield Hero: The Dragon Hero

There is a world where humans and demi-humans thrive. Then monsters came to ruin the very land. Fortunately, the world itself have their own legendary heroes called, The Four Cardinal Heroes, who have four weapons, one weapon for each person, the Sword, the Spear, The Bow and The Shield.

There is even another Hero known as the Dragon Hero. Who is not just a legendary hero but an ancient hero a long time ago. Way longer than the Four Cardinal Heroes.

A young man came from another world, accidentally killed. But was reincarnated to another world where he meets the queen of a kingdom of that world.

Now he will face the impending Waves of Calamity and Catastrophe, with the power of the red and black twin dragons. This is the story of the Dragon Hero who will save the world from destruction.

A/N: I'm basing this story on the Kamen Rider Dragon Knight American Version.