The manga adaptation is currently ongoing, but official releases can be sporadic or on a monthly schedule.
Nihonkoku Shoukan (Summoning Japan) manga chapter 47, titled The 73 Nation Alliance nihonkoku shoukan raw chap 47 raw manga welovemanga top
The primary source for raw chapters is often ComicWalker (KADOKAWA) or Nico Nico Seiga , where new chapters are serialized. The manga adaptation is currently ongoing, but official