During the summer of 1962, the Sandlot boys finally meet the one person they thought might not even exist: Yeah-Yeah’s older sister, Y/n. After years of hearing stories about her, she suddenly becomes part of their chaotic little group, fitting in faster than anyone expected. While the boys spend their days playing baseball, getting into trouble, and surviving one wild adventure after another, Benny Rodriguez finds himself distracted by the girl who challenges him at every turn.