Waruiotoko 
Only the Villainous Lord Wields the Power to Level Up: Volume 3 [EPUB ebook] 

Erhin has succeeded in saving Euracia and her people from the war with the Brijit Kingdom. Having won a secret iron mine for himself in the process, he begins making his move toward world domination in earnest.

Meanwhile, Frann Valdesca, the Naruyan commander he defeated during the previous invasion, is preparing for a revenge match in the form of the Grand Subjugation. With his prior knowledge of the event, Erhin comes up with a clever plan to take over Runan in the chaos. Will it work, or will Erhin’s efforts go up in flames?!