Qing Ci, Yu An (?) And their friends save the world together in another world. The main world is the campus, followed by the other world. In their spare time, they will use strange weapons (weapons from another world) to enter the other world to go on missions. Their superior Shuguang (name of the camp) seems to have a secret. As he grows older, Yu An's true identity slowly emerges... And finally greets their farewell.
Intention: Friends help each other, parting through life and death, forge their growth