Grave of the Fireflies is the first Studio Ghibli film that Disney never had distribution rights to in North America, since the film was not produced by then-parent company Tokuma Shoten (Disney formerly handled the North American distribution of all Tokuma Shoten-produced Studio Ghibli films before GKids picked up the distribution rights.)
Grave of the Fireflies is the first Studio Ghibli film that Disney did not distribute in North America, as it was not made by their former parent company, Tokuma Shoten (Disney previously handled all Studio Ghibli films' distribution in North America before GKids took over).