Yoshi and his sister Kiru are heirs to the Hiragi legacy. Their uncle Chikara seizes a mystical chest containing a divine orb and, intoxicated by its power, unleashes violence—killing the School Master and tearing the family apart.

Years later, alliances form with Gakuto as the siblings infiltrate Chikara's stronghold, face Kama (Chikara's son and their conflicted cousin), and struggle to reunite both their family and the sacred artifact.