After the Nuclear Blast, I Became a Beast in the Apocalypse!

A nuclear war broke out, with the United States, Europe, and Japan becoming the worst-hit regions. Yet nuclear radiation did not kill that many people. Instead, the shockwaves from the nuclear blasts split the earth open with three colossal fissures, releasing unknown gases from deep underground and killing countless lives.

The only great power left in the East led all of humanity in resisting for three years. In the end, it retreated to the moon with the last seeds of civilization, while everyone else was left to struggle in hell!