Dual Transmigration into Bright Sword: Delivering a Torrent of Steel to My Great-Grandfather

Qin Yuan travels between two worlds to 1939 and binds himself to a Population-Building System. The more people under his command, the more points he earns.

At this time, his great-grandfather, Qin Xiaobao, is trapped behind enemy lines while serving as a reconnaissance scout.

To back up his great-grandfather, Qin Yuan establishes an intelligence network behind enemy lines that strikes fear into the Japanese: the [Yama Kings].

You want to play at infiltration? I'll put on night-vision goggles and catch Japanese soldiers like chickens!

You want to wage a code war? Modern computer logic gives me an overwhelming advantage, and I'll intercept the Japanese army's top-secret messages!

The head of the Special Services Agency breaks down: “Baka! Who on earth is this guy with the codename ‘Yama King’? Why does the Independent Regiment know our codes as soon as we change the codebook?!”

Qin Yuan sneers: “The times have changed, sir. I'm just an ordinary supply porter.”