To go along with the short film, Apple has also released a cool behind-the-scenes featurette that shows just how Miike was able to bring the project to life, and more specifically, how he was able to shoot the entire film on the iPhone 15 Pro.
You can see in the video that the iPhone 15 Pro handles a lot of the low-light and fast-action sequences quite well. Using Apple ProRes LOG also allows for more flexibility in the edit, so a lot of the work could be done there to grade and balance the footage out in post.