Is there a page missing after the 3rd and 4th pages? The teacher’s next line sound like he’s referencing something he said on the previous and he ask Miyamura about being excited going to his house earlier, but we don’t see Miyamura ask that question. It seems like there’s an in between page where they ask to go to his house and he threatens them kinda? That or I just can’t follow a story (both are possible)
Wait, it's prohibited to bring a full cake in Japan?! Why, though? What's the problem with bringing food to class? Well, if they ate it during class, it's understandable. But, other than that, I don't see a problem with it.