Shirou Emiya should have died at the end of the war, pouring the last of his energy to destroy the corrupted Holy Grail. Unfortunately, Angra Mainyu had other plans for him. To avoid its inevitable defeat, it forcefully gave itself a second chance. However, it might not have gone as it originally intended. In a different world and war, he will have to finish what he started.

To be a magus is to walk side by side with dead. Of course, that doesn't mean you can't have some fun while you do so. He was a thrill seeker, a swindler, a magician, yet many people called him mad. So, what would happen when the world's most hedonistic individual, takes an interest in an innocent boy who dreams of becoming a hero? Madness, that's what!

Those who personally knew the King of Heroes often had different opinions of him. A tyrant, a possessive individual, a selfish man... But there was another side of him not many know about.

Heroes don't always have to be well known to be recorded in the throne. Even those who are barely recognized cannot go unforgotten. When the fate of the world is at stake, those at the Chaldea observatory facility will take all the help they can get, even if they have to barter with the unknown.

Having lived the life as a tool for humanities survival amongst the alien threats, the Master Chief has finally passed on. Hailed as the greatest human to ever live, he has been summoned by the collective will of humanity for a job that required his assistance. A job on the same scale as the covenant and the flood. Preventing genocide was his greatest achievement, so why stop now?

For eons he has watched over humanity, even long after his death. Simply watching and observing. When the world is set ablaze in a sea of fire and nearly all life on the planet is swept away, he returns once more to fan the flames of the last embers of humanity. This is the start of the Grand Order and the greatest trials of mankind.

He watched as they waged wars and forged peace, populating Gaia with their descendants and children as they passed on their wills from one generation to the next. Then, in the year 2016, he saw life burn to ashes in a sea of flames. But those who were left, burned with a fire of their own. It was his job to guide them, just as he did thousands of years ago.