Shirou never expected to be summoned to another world, but now all he wants to do is finish save it so that he could return home to his family. But it order to return home, he will first have to survive. First rule of surviving as a summoned hero, don't trust ANYONE.

Death and corruption. A rotting Empire, and a man who would sit at the heart of a revolution. In a dark world of constant death and deceit, what place will a man whose only wish was to save others be able to carve out for himself?

They were both Counter Guardians. They were both siblings that had never met. They were from separate realities. Yet a disturbance unexpectantly brought them together. Their fates were now one.

It is the 45th Millennium and the galaxy is dying. On the verge of victory over the Imperium, the Chaos forces have proven unable to stem the tide against the Great Devourer and its trillions of Tyranids. Only one option: cross the dimensions, find a hero able to triumph where billions have utterly failed and change the course of the past...

AU. Because Argo is far too devious to be human and Kirito is doomed to forever be pulled into dangerous and unbelievable circumstances for as long as he lives.