Fuyuki City, a land where Heroic Spirits walk and Magi wage war for the Holy Grail. In this familiar yet distant world, Mu Yuan awakens—not as a Master, not as a Heroic Spirit, but as something entirely different.

With no magic crest and no bloodline to rely on, Mu Yuan should have been just another face in the crowd. But a high fever awakens within him the 《Book of Heroic Spirit Development》, a mysterious artifact that allows him to forge Heroic Spirits from his own legend.

By traveling through time via his Holy Relics, Mu Yuan will carve his own legend, shaping himself into the ultimate Heroic Spirit. In a world of magi, monsters, and miracles, can a mortal without a crest become a legend that even the Throne of Heroes must recognize?

Thus begins the chronicle of a man who chooses to become his own Hero.

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