On the continent of Artoria, your spiricasting determines your rank. Since the fracture 3000 years ago, the continent has been filled to the brim with powerful, supernatural entities called spirits, and with them, the humans of the time developed spirit hearts, capable of controlling and manipulating spirits to do their will. And now, 3000 years later, in a small village in the forbidden zone, a child suffers from a rare and deadly condition, causing the malfunction of his spirit heart.  Lost and outcast from society, Argus Wayfinder trains every day, for months and years on end, all to prove to the world around him that there's strength in more than just spirits. He wants to prove that there's strength in the sword.