As prefecturals draw near, Haruka and the other swim club members continue to improve.  Meanwhile, Rin reveals his motivations for swimming.  The swimmers must now show what they have accomplished at the tournament.
Hyaluronic acid.
Hyaluronsäure.
Acide hyaluronique.
Acido ialuronico.
Ácido hialurônico.
Гиалуроновая кислота.