Congratulations to Studio Ghibli and everybody else that worked on it. For context, here are the full list of nominees:
- The Boy and the Heron
- Suzume
- The Super Mario Bros. Movie
- Spider-Man: Across the Spider-Verse
- Elemental
- Wish
See the linked article for more discussion of award nominations and such.
Looking at the list of winners in the category, this is definitely the first anime film to have won. Very few have even been nominated in the past. As far as I could tell from a glance, there are only four: