About "Atogaki" it's "Afterword", but for "Maegaki", I don't know.
"Preface". You could also use "foreword" if you want to be symmetrical, but for some reason "preface" feels better to me.
Edit: Looked up the difference between preface and foreword. A foreword is usually written by someone other than the author, so my instinct was right, "preface" is better in this case.
I wonder if Shigure changed a little bit.We're going to stay with you forever you know.Going out of your way to check how she is, you really are worried about her after all. How noisy you are.It must have been painful for you. I'm sorry.It's okay now. Be at ease.