Zedd is a 15-year-old boy who lives in Calm. He is frustrated by his current daily life and feels that somewhere out there is a place where he can live more fully.
One day, at the invitation of a mysterious wind, Zedd dives into a space-time crevasse, seeking the “answer” that might be there.
Riding on the wind, he arrives in a world where warriors called “Shard Casters” fight endlessly with each other, using magical crystals called “Shards”.
With the power of the Shards, the Shard Casters are able to use magic and control monsters called “Spirits”. Fascinated by that power, Zedd also aims to become a Shard Caster. However, he still doesn’t know that residing in his body is “Amil Gaul”, a mighty Spirit with the power to influence the world’s future.
Descriptions taken from AniDB.net