@Rudwik the previous TL (@ThePaulBunyanTrophy) had a drama with MD and so pulled off all their releases from MD. You can read more at My Sister's Funeral main page comment thread or search for it on r/manga or r/scanlationdrama.
@Yolomon I'm guessing the series got licensed to English. It is @ThePaulBunyanTrophy 's standard practice to delete the chapters worked by them if the series got licensed.