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In the future that is within reach, the world has undergone earth-shaking changes, and outside the lives that people are accustomed to, justice and evil begin to confront each other.

The virtual space erodes the real world, and everyone will be swept away by an unprecedented disaster. No one can escape intact. All you can do is to hold the weapon in your hand - your mobile phone, and guard what you should cherish...

As the boundary between reality and the Internet disappears, a new world called "Zero Domain" appears in front of people. Facing unprecedented challenges, the weapon you can use is the mobile device in your hand...

If all the memories that make up you disappear with the wind, will you still be the same person you once were? If you have committed an unforgivable sin, will you do your best to atone for it?