The world is vast, inhabited with many creatures on every single mass of land... And even beyond. For this earth houses more lifeforms than what initially meets the eye. Non-physical beings also roam this planet. Their world might not be perceivable, but it is present all around.
These beings are called spirits. They watch over all the different species on earth, but there is one specie they watch in particular: Mankind. For its magical ability bares close resemblance to theirs.
Spirits and humans also share their lust for battle. However, spirits are unable to fight in their own world, because they do not possess a physical body. Only though human magic can their body be materialized. Therefore, when a spirit finds a human interesting. It will choose to present itself from the spirit world and form a contract with them. This contract binds the spirit to house within an object of the human. Through this object, the spirit can be summoned by its master, but they will not appear for immoral reasons. Only when their master is engaged in a battle, will a spirit present itself.
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Over the years, Spirit-Battles have become the biggest form of entertainment in the entire world. For this reason, Spirit-Battles can fulfil many desires; fame, wealth, or even power. Every child dreams of battling at the highest stage; The Spirit-Master world cup. However, there can only be one who remains at the top. No matter what motivations may drive a person, only one can be blessed with the title of reigning Spirit-Master World Champion.