Lajoie/Lagha defended their junior national title at the 2018 Canadian Championships, breaking their own Canadian record. They closed out the season at the 2018 World Junior Championships in Sofia, Bulgaria. They placed second in the short dance, earning a silver small medal, but placed fifth in the free dance, resulting in them placing narrowly off the podium in fourth place. Lajoie commented: "The free dance went super well for us. We were in the moment and managed the stress. We achieved our goal by being in the mix for a spot on the podium."