300 years ago, which was the year 2020 of the Blue Star Calendar!
A drastic change occurred on the Blue Planet. Gates to the Underworld suddenly opened all over the world!
Countless undead, evil spirits, demons, and demonic beasts poured into the blue planet from the gate of the underworld, bringing great disaster and pain to humans!
Fortunately!
The humans awakened their guardian spirits one after another. With the combined efforts of the guardian spirits and a portion of the undead, they finally killed all the evil spirits, demons, and demon beasts that had intruded into the Blue Planet and guarded the entrance to the Underworld!
For the sake of eternal peace, countless spirit hosts formed an alliance army and began an endless journey to conquer the Netherworld!
This era had also entered the era of spirit hosts, also known as the era of guardian spirits!
And the story began…during the 2320th annual Spirit Host test at An Nan High School…
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