Combined Arms Battalion: War Against Japan, Starting in 1940

In the world of anti-Japanese war films and TV dramas, late February 1940.

An army battalion from the planet Andromeda and a young man with an "Anti-Japanese Mission System" suddenly arrive in Mengjiang County, on the northeastern frontier. With the last sparks of the resistance forces on the brink of extinction, they boldly take action, rescue the resistance, establish a base behind enemy lines, and relentlessly attack Japanese and puppet troops.

What they don't know is that an enemy from another plane, hailing from 1980, has already arrived. It is building up strength for the Pacific War and scheming to rewrite the course of history.

Two forces from the future probe through the fog of war and discover each other's presence, setting off a series of desperate battles.

(Note: Things will be a little tough for the first two or three months, but then the combined-arms battalion will have a steady supply line bringing in personnel and materiel from 2024. The national team will enter the fray! Meanwhile, the enemy's supply line will be cut off.)