Primary school students Yutai Yamazaki (Yutai Yamazaki), Youji (anti-Tian Xiaoxing) and other companions argued about whether the fireworks were flat or round when the fireworks rose. To no avail, everyone became confused, and in order to solve the confusion, they decided to take the opportunity of the summer fireworks display to check on the lighthouse. Diandao and Youji are secretly in love with their classmates, the precocious girl Naisha (O'Caihui), who has something on her mind because her parents are divorced. After a 50-meter swimming race between Diandao and Youji, the winner of the Nisha contract accompanied her to see the fireworks and didn't want the other party to finally decide to go to the lighthouse with everyone. Nasha finally pulled the road where he lost the race, but his destination became the train station or even Tokyo.