The hot summer is here again, and the audience is welcoming the second season of the energetic and refreshing sports show "Free!"! The five swimming club partners once again unfold a youth story about swimming and friendship with their particularly eye-catching muscle lines. In the second season, the protagonist Nanase Haruka (voiced by Shimazaki Nobunaga) and her good friend Tachibana Makoto (voiced by Suzuki Tatsuhisa) become third-year students at Iwatobi High School. On the one hand, they are worried about the lack of new members joining the swimming club, and on the other hand, they are facing the problem of where to go after graduation. Nagisa (voiced by Daisuke Daisuke) and Rei (voiced by Daisuke Hirakawa), who are also members of the swimming club, are actively preparing for the national competition. Compared with the first season, the biggest highlight of this season is the appearance of the new character Yamazaki Sosuke (voiced by Yoshimasa Hosoya). He is a good friend of Rin (voiced by Mamoru Miyano) in elementary school. He is a strong swimmer and returns to join Rin's swimming club after transferring to another school. Two swimming clubs, two relay teams, what kind of youthful splash will collide in the future national competition?