May 18th is Zhang Yan's nightmare.
On this day, countless people disappeared from this world.
School suspensions, strikes, paralysis of order, rampant theft...
Is it an unknown civilization? Is it a prophecy? Is it a disaster?
Can such a huge campus still maintain a pure land?
"I believe that the world will eventually get back on track, and that people who left will always come back. But until then, we have to survive."
"... Never think that we can escape. Every step we take determines the final outcome. Our footsteps are heading towards the end of our own choosing."
Purpose: We will always remember every building and every tree on campus, and we will remember each other who are brave and unyielding and never give up hope.
