As environmental pollution becomes more and more serious, a sudden disaster sweeps the world. In order to avoid the disaster, people choose to live underground.
Jiang Huaijin was full of curiosity about the outside world. He was not afraid of tigers as a newborn, so he just wanted to go and see the outside world. An unexpected opportunity allowed him to seize it. On the ground, he met a magical girl. They adhered to different ideas and discovered each other's shining points amidst difficulties. Finally...
The ending has not been decided yet.
Purpose: Bond, Commitment, Ideal