16 minutes into episode 4 some friends of Subaru can be seen in the background, having played a game of ball with him. The names of the ones in the white shirts are unknown. The girl in the pink shirt is Aoi and the boy in the black shirt is Hatsunari.
There is a girl with short blue hair, another with short purple hair, and a girl with very short spiky grey hair. The purple-haired girl may be one of Aoi's friends seen shopping in episode 7.