Her boobs doesn't match her body, she is too slim for them it does disturb me.
Other than that this game has some qualities, and some bad points.
I think the sandbox aspect feel clunky, not really natural and have to be improve. It's only the start and your first game I think it can (and need) be improved.
I'm in the hallway, can't do anything to advance the story, maybe it's me maybe it's all the content I don't know. If it's the first it has to be clear, with some help I don't know, if it's the second, you have to tell us when it's finished.
I'm not a big fan of sandbow, so it has to be better than that for me to continue.
I also have some delay when I click enter to have the next sentence and even if I can survive it's a bit annoying.
Last aspect that does disturb me is their name. Makoto etc.. okay but why (except Akane and the girl in the restaurant) they look like occidental people ?
Some of them don't like Dylan so maybe I missed out something.
For the good points..
The start remind me Persona 5, the murder aspect on the synopsis could even remind Persona 4.
Girls have their style, I haven't see a lot of girl like Akane. Same goes for the pink haired girl, I already like her with her original hair and her ojou-sama personality.
I do like sports settings, if its explored further I could find that interesting. I still have to see the mystery part, also something that I like.
It has to be improved. Really. But it has some interesting points.
Good luck dev' you can make something great.