Legend has it that there is a train that flies above the white clouds in various places. The people in the car have strange abilities, but rarely have contact with outsiders.
It is said that these people will use their abilities to help others at the request of the client.
However, no one knows where this flying train will appear next.
Just when people were about to forget this legend, the new generation on the train - Big Dipper began to accept commissions...
This is the collision between reality and fantasy, the hesitation between growing up and staying, and the battle between hope and disappointment.