Lin Yin and Xing Yu are childhood playmates who promised to be together forever under the starry sky, however their innocent wishes were temporarily frozen by reality. Many years later, Lin Yin transferred to Xing Yu's school and on her first day she unexpectedly became wrapped up in a situation that left her at a loss for words. Amidst this chaos, Lin Yin meets up with Xing Yu again... But the embarrassment of not knowing each other makes Lin Yin hesitate to approach him. Can these two small planets reconnect in a new and exciting world?