Since you are looking for the "raw" (Japanese) version, here are the primary legal sources where the chapters are serialized:
"Nihonkoku Shoukan" offers a unique glimpse into Japan's post-WWII era, exploring themes of rebuilding, cultural clashes, and everyday life. While raw manga is available online, I encourage you to support official releases and licensed translations to appreciate the creators' work. nihonkoku shoukan manga raw