Free!: Timeless Medley - The Promise (2017) Plot Summary & Timeline

In junior high school, Haruka Nanase joins the swim team, but quits after a falling out with his elementary school rival Rin Matsuoka, home from schooling in Australia, causing Haruka’s teammate, Ikuya Kirishima, to resent him. The swim team disbands, as Asahi Shiina moves away and Ikuya studies abroad. In high school, Haruka prepares for tournaments with teammates Makoto Tachibana, Nagisa Hazuki, and Rei Ryugazaki, while Rin, who has since reconciled with them, does the same. Haruka is in his final year of high school, but has not yet made post-graduation plans, even after being scouted by a university during prefecturals. Meanwhile, Makoto becomes inspired to become a swim coach after helping Kisumi Shigino’s little brother, Hayato, learn how to swim.

During regionals, Haruka is overwhelmed by the pressure of performing in front of university scouts and stops swimming in the middle of his individual event. When confronted about not having a dream by Rin, Haruka becomes uncharacteristically angry, which concerns his friends. Later, Makoto attempts to reason with Haruka, but they end up in a heated argument in which Makoto reveals his decision to attend university in Tokyo to fulfill his own dream. Haruka feels even more lost, but with prompting from Makoto, Rin takes Haruka with him back to Australia. The trip inspires Haruka to swim at the college level and upon returning to Japan, he makes amends with his team. With renewed hope and bonds with his friends, Haruka and his team place 6th overall in nationals.

In a post-credits scene, during nationals, Sosuke Yamazaki gets lost, only to end up watching the individual medleys, where Ikuya from Shionezaki High School overtakes everyone. After the tournament, Ikuya discusses his condition with his older brother, Natsuya Kirishima.

Sosuke Yamazaki, Rin’s best friend from childhood, transfers into his class at Samezuka Academy. Rin and Sosuke had promised each other as children to continue their swim careers together but unbeknownst to Rin, Sosuke has incurred a serious shoulder injury from overuse, yet continues to swim as they prepare for upcoming tournaments. While Rin is serious about swimming, Sosuke struggles to find a reason to continue, further straining their friendship.

At the regional tournament, Rin finally learns about Sosuke’s injury. Sosuke, now cherishing the bonds he has forged with the swim team, is determined to participate in the team medley one last time. The team places second in the race, thus qualifying for nationals, and Sosuke decides to get medical treatment for his injury. Despite dropping out of the nationals, he offers to help Aiichiro Nitori and Momotaro Mikoshiba prepare.

In a post-credits scene, Sosuke warns Rin about Ikuya, whose freestyle resembles Haruka’s in both form and speed. Meanwhile, Ikuya refuses to attend the nationals’ awards ceremony to call Natsuya. Gou becomes determined to recruit new members for the next school year. Aiichiro, Momotaro, Nagisa, and Rei reaffirm their rivalry and plan a joint practice together. While Asahi exchanges farewells with his swim team at Kazami High School, he receives a text message from Kisumi. Haruka and Makoto arrive in Tokyo.