It's not in the gift shop, it's in another part of the building. We learn that izu gave it to the girl as a gift, and she's so freaked out that she doesn't know what to do with it. She runs off to find a bath for herself, but she can't find izu, so she runs back to the cafe to find him. He's all, "You can have mine," and she runs off crying, "What am I crying for?"
It's not in the gift shop, it's in another part of the building. We learn that izu gave it to the girl as a gift, and she's so freaked out that she doesn't know what to do with it. She runs off to find a bath for herself, but she can't find izu, so she runs back to the cafe to find him. He's all, "You can have mine," and she runs off crying, "What am I crying for?"