I Got Stuck in the System Bug at the End of the World

Infinitely streamed apocalyptic novels, everything you want about the apocalypse including zombies, natural disasters, rebirth, mechas, farming, systems, space, and collecting supplies are all here. The protagonist is decisive in killing, neither a virgin nor a fool. He is as fierce as a tiger in planning ahead and sends a hydrogen bomb at the beginning. Since the protagonist learned the bug of the card system, he no longer has to worry about the crisis of the end of the world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.