Set 26 years after the events in Touch, MIX follows the legacy of Tatsuya Uesugi, the renowned hero of Meisei Academy High School's baseball team. Despite the team's past glory, it has since faded into obscurity. Enter stepbrothers Soichirou and Toma Tachibana, determined to resurrect Meisei Academy's former baseball prowess and compete in the National High School Baseball Championship. As skilled players in their middle school years, Soichirou excels as a catcher and batter, while Toma, a gifted pitcher, has abandoned pitching for undisclosed reasons. Joining forces in high school, the duo forms a formidable battery, striving to achieve their dreams on the diamond. Prepare to be moved by their unwavering passion and dedication in this poignant high school baseball saga, appealing to audiences of all ages and genders.