Joou Heika no Hokyuusen
女王陛下の補給線 · じょおう へいか の ほきゅうせん
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Front-line soldiers call the logistics squad the fat pigs in the back. But this is a proud story of the underestimated and ridiculed group. Two years since the war between the Kingdom and the Republic began, amidst the inhumane fighting, they are the "soldiers who fight for the soliders." With a burning desire in their hearts, the 202 Experimental Logistics Squad drive the rail train "Ravik" across the deadly front line and through the hellish battlefield to bring life! (Source: Kodansha, translated)
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections