I Transmigrated to an Ancient Battlefield, and Killing Makes Me Stronger

Originally a modern engineering student and military history enthusiast, he transmigrates to an ancient world resembling the Ming Dynasty, where he is drafted by force and sent to the battlefield. After killing his first man to save himself, he awakens the Killing System. Every person he kills makes him stronger, allowing him to gain points in the victim's physical attributes. If he kills a martial arts master, he can instantly acquire their techniques and inner power. Step by step, he rises from cannon fodder in a suicide squad to squad leader, platoon leader, centurion, commandant, middle general, general, grand general, commander, Grand Marshal of the Armies, and eventually a prince of a different surname. When he becomes commander of the Eastern Theater, he seizes the opportunity to wipe out all the men in Japan and turn the country into slaves. Enfeoffed as a prince of a different surname, he takes charge of all affairs on the eastern front and mines all of Japan's silver deposits, helping drive the Industrial Revolution in his mind.