Odd Fish is a feel-good film that follows childhood friends Hjalti and Björn, who run a seafood restaurant in their hometown during the summer. They dream of keeping the restaurant open year-round, and when an unexpected opportunity arises, Björn reveals to Hjalti that she is a transgender woman and will be known as Birna from now on. These changes test their friendship, and both must face life with a new perspective to preserve what matters most.