Rin reminisces with Sosuke, his classmate at Sano elementary school prior to Rin's transfer to Iwatobi elementary school. Sosake tells Rin he is at Samezuka in order to spend his third-year in his hometown before going pro. Meanwhile, Coach Sasabe plans a community swim festival to be held at ISC Returns and asks the Iwatobi team to come up with a main event. Haruka suggests a relay and Rin is asked to assemble a Samezuka team to swim against Iwatobi. Prior to the relay, Sosuke warns Haruka not to get in Rin's way as he pursues his Olympic dream.