Haruka and Makoto start their student life in the big city of Tokyo, where old acquaintances and new challenges await them. There they also have a reunion with their childhood friend Ikuya, who seems to be under a lot of pressure to perform. Although they only want to help him, his new friend Hiyori seems to object to their "interference". Nagisa and Rei, on the other hand, try to show the newcomers of the Iwatobi swimming club what swimming means to them before they have to leave school themselves. So they all plunge headlong into the torrent of events to realise their dreams, which have sprung from their common bonds...