Long ago, the world was ruled through endless conflict and oppression.

Then, five beautiful goddesses, songstresses, descended upon the war torn land. Using the powers of their song to control the might of magic, they overthrew the despotic rulers of the various lands and ushered in a new age of peace to the world.

The songstresses came to be worshipped as "Intoners" and were tasked with ruling the world.

The Intoner One had a strong desire to bring peace and stability to the world. With her command over the other Intoners, One comes to rule over the world.

One day, her older sister Zero appears before her with a dragon by her side. An Intoner herself, Zero is considered the mightiest of all Intoners.

Why has Zero suddenly appeared before One?
Why has she allied herself with a dragon?
And what exactly is an Intoner?

The dark clouds of turmoil loom on the horizon once again...