NGNL Zero is a strong prequel movie with a much heavier and more serious tone than the series. I was caught off guard and cried multiple times throughout. It's worth watching the series for this movie alone.
No Game No Life
No Game No Life is a gorgeous game-centered Isekai with lush worldbuilding and an interesting story. It also brings the worst of ecchi objectification/sexualization and the Smartest Man In The Room genre.