S3E11 Streamline of Unity!

Streamline of Unity! (集結のストリームライン！ Shuuketsu no Sutoriimurain!) is the eleventh episode of season three of the Free! anime and the thirty-sixth episode of the overall series. It aired on September 19,2018.

Synopsis
Haruka Nanase and Rin Matsuoka break from training to attend the high school National tournament, reuniting with old friends as Rei Ryugazaki and Nagisa Hazuki participate in their last races as high school students. The future of both the Iwatobi Swimming Club and the Samezuka Swimming Club seem assured. A retrospective of Rei and Nagisa is seen.

Note: This synopsis is taken from Wikipedia, as permitted by the text's author.

Characters
List of characters in order of appearance: