Nationwide Resistance War: Summoning Billions of Fourth Calamity Players

[Fourth Calamity + ensemble cast + War of Resistance + online game] History graduate student Lin Yan has barely transmigrated when he runs into a Japanese army massacre of a village. As a Type 38 rifle presses against his forehead, the [National Resistance System] blares to life: "Bound to the 2025 online game Ironblooded Rivers and Mountains. The day the Japanese invaders are wiped out is the day our men return home! I can't do this alone, so I'll summon the Fourth Calamity as soldiers!" Players flood the comments: "After our comrade died, his name was added to the memorial hall. This isn't a game!" The synopsis can't do it justice, so head straight to the story!