In the Age of Annihilation, I Awakened the Game System

The Age of Annihilation, the dark age after the end of nuclear war. 223 Years ago, a nuclear war that spread across the world destroyed the entire human civilization. Only a small number of people hid in underground shelters in advance and survived. A 20-billion-ton TNT-equivalent nuclear bomb washes the ground, and the nuclear radiation after the nuclear bomb explodes is a deadly weapon that harvests lives. There is no single creature. . . . . . The orphan in the D city shelter accidentally awakens to the game system and explores and survives in this apocalyptic world.