In the peaceful Toon Village, there was a special mineral called Toon Crystal.

Toon Crystal was able to give users a powerful boost, and residents of Toon Village, who were worried that someone would abuse it, created an organization called Toon Guardians.

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The Toon Guardians were an organization of Tunors that used the power of Toon Crystal to process Toon Crystal and create an artificial intelligence robot Toon to protect the town with Toon.

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Then one day, a group of villains named Anti, who coveted the power of Toon Crystal, began to attack them. However, Antti did not beat the Toon Guardians.

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Anti created a virus called V, infecting Toons and fighting Toon Guardians.

So Toon Guardians created Toon Defense, a battle simulation, to prepare for future battles.