When Sion, a young boy in a small rural village, was set to receive his Class, the divine gift bestowed on all people, he received nothing. Or so everyone believed. Sion alone could see the name of his class: "Inheritor."

Five years later, Sion still has not come to understand his power. He makes up his mind to go out into the world and learn. Along the way, he encounters a pair of travelers under attack, and cannot leave them to fend for themselves. In return for his bravery, Sion is welcomed into the inner circle of his home country of Dracabana.

In this new environment, Sion, alongside the friends he meets, begin to unravel the mystery of being the "Inheritor," helping whoever he can along the way.