After an invitation to a junior tennis tournament at Wimbledon post-Nationals, Seishun Academy finds themselves in England alongside rivals from Hyoutei Academy, Shitenhouji Middle School, and Rikkai University-Affiliated Middle School. Prior to the event, players are ambushed by thugs, leaving some injured and hospitalized, with only a silver ring linking the assailants and a leader named Keith. Amidst planning to stop the gang, the group is visited by Ling Xiu, a former member of the banned Clack—a notorious tennis group known for their aggressive tactics. Xiu warns the students about Clack's dangerous nature. Despite the caution, Ryouma, spurred by determination, embarks on a risky mission with Xiu to confront Keith and the Clack members, aiming to thwart their schemes. As Ryouma learns more about Xiu's motives, his resolve to defeat Keith and rescue him from his destructive path strengthens.