A very promising start. The whole first chapter is a bit emotional, there's a lot of anger, depression and downright hatred inside MC, he's quite the fatalist and pessimist right now, as you keep going forward with the story, you'll understand why, seeing as the title isn't about a Summer season, it's about a girl named Summer, and she's being spoken about in past tense.
I wonder what happened, and I wonder if it's as bad as I think it is, but I hope not, I hope it's nothing that tragic and that one day she and MC would be reunited.
But perhaps with the help of his sister and this girl that got bumped by a car he'll come to, will see the light again and start healing, and why not with the help of other girls too, haha.
But yeah, a very promising start, pretty emotionally charged first chapter, and I'm loving the art and models. The use of light in some of the scenes was beautiful too, pretty cinematic, looked almost real.
I'll be definitely following this game, absolutely. Keep up the good work dev!