I hate to be that guy but perhaps MC's age should be brought up a bit. He's said to be 22 and not long after notes that Niwa is just above half his age. So she's 12-14 or so? Assuming all the other girls in her class are about the same age. Really makes things awkward and uncomfortable given this is to be an 18+ game.
Besides that though the game seems interesting with a nice cast of characters who all look unique!
I have an idea on what Suzu's issue might be but the sooner we can get the stick out of her ass the better. Giving us a hard time about things being uNnEcCeSsArY when she's the one being unnecessarily rude and hostile.