北京一家棒球爱心基地，集结着一群性格各异的少年，“刺头”新人马虎、天真烂漫的小吃货李海鑫、勇敢有担当的队长大宝，孩子们从一开始的打架冲撞，难以融合逐渐变得惺惺相惜，彼此搀扶争取着生活的希望。在积极备战美国比赛的时候，棒球基地却陷入了新的困境，少年和教练们的生活将面临更大的挑战……而投手小双能否回归，更是牵动着大家的心弦。

In the suburbs of Beijing, a group of troubled teenagers learn to play baseball with a famous baseball coach, while struggling through their internal conflicts and the inability to play baseball games like professionals. When an accident took place in the winter of 2017, countless local residents got evacuated in Beijing, the baseball team, as well as their playfield were facing the unexpected obstacle—the relocation of their headquarter. With the World Series of the Little Pony League waiting around the corner, the whole team will have to pull themselves together and face the competition on the international stage.