>>2492065Wow, I had no idea. I forgot how odd the early volumes could be at times, and it seems the anime either changed all of those to Yunocchi or left them out. The volume 4 one can be explained because she uses Yunocchi in the first panel to refer to the person right in front of her, but Yuno to the person she first met (who became Yunocchi only a few minutes later, but anyway). That's a great catch.
