Madou Kikou: Kowareta Yuusha no Fukushuutan
魔道機巧 : 壊れた勇者の復讐譚 · まどう きこう : こわれた ゆうしゃ の ふくしゅうたん
est. Rough estimate based on volume count, reprints and magazine — not an official figure
External databases: AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections