So far, this has been really nice. The relationship between the main characters feels organic and their banter is pretty funny. Katsumi has a great personality, not to mention how obviously attractive she is. The proportions are just right and I love that she's so much bigger than Arata.
I would love for the game to get some explicit scenes, but I also understand If that's not the atmosphere you're going for. My only gripe so far is that in some shots the couple looks very similar to one another, making them look like siblings.