In this world, among all humans, some are gifted with powers that they can use to fight the Voidbringers. The power can be produced by only one part of their bodies.

Atsuki Saito (斉藤あつき) grew up having multiple powers that can be produced by multiple parts of his body. Normally, others can produce powers with only their hands, legs, and more. Some can even use both their hands and legs, but Atsuki could use them all without any hesitation. No one knows the reason why he is like this.

Since Atsuki was very powerful from a young age, people were scared of him, doubting that he was somehow related to the Voidbringers that wanted to destroy humans for power. However, he wasn't like what people thought of him; he was actually a generous and kind-hearted person on the inside.

Aside from that, there were Voidbringers who wanted to devastate the humans and take over the world themselves. They were like humanoid creatures with insane demonic powers.

There is a rumor that there was a god named Arka (アルカ) who may have created the Voidbringers. However, people do not even know whether Arka existed or not. But some believe he is the one who created the Voidbringers or is somehow related to their creator. Some people even believe that he is still alive, though it has not been proven whether he is real or not. Still, people do not know much about Arka, as it is just a rumor.

The Voidbringers' bad intentions, such as destroying humans and gaining control over the world, were too horrifying for the humans to envisage.

After all, the Voidbringers were much fiercer than humans, as they could kill millions of people in seconds. However, the humans were suddenly gifted with mana. They could use magical, elemental, spiritual powers, and many more.

They decided to call themselves The Arcane Warriors, and they also established an organization called The Celestial Concord. Then, they took a vow that they would even sacrifice their lives to save the world from the Voidbringers. After that, they kept fighting the Voidbringers, and as a matter of fact, they are still fighting them because they actually want their world to be peaceful, not obliterated.

There is no end to it because the Voidbringers keep growing and evolving with power. So, the Arcane Warriors must still fight them. From this point on, Atsuki's intricate story begins...