Don't think about how in the outro Satoru and Shoko are hit by the sunlight, and are the only ones that turn around to wave at each other...
Whereas Suguru is in a shadow area, and just waves his hand with his back turned...
Symbolising how there's going to be a fracture between all of them and Suguru will go down towards a dark path, and will never turn back to how he used to be.














