The art for Hayato is incredibly nice, I would have liked to see a bit more of it. The twist is subtle, overall everything is very cute and charming. The writing is also really nice, you did a good job at making me (the player) feel like I'm actually friends with Hayato. My only issue is that I don't think making the mini-games each day more "difficult" was that necessary, it just made progressing the narrative a bit more tedious.
Otherwise, very cute and simple game!