The male protagonist was reborn and returned to three months before the outbreak of the extreme cold apocalypse. He accidentally opened the ancestral cornucopia and gained unlimited replication capabilities. Facing the coming super solar flares and geomagnetic storms - a disaster that will destroy technological civilization, cause the extinction of most species, and mutate animals and plants, he decisively used his replication ability to hoard food, medicine, thermal equipment and weapons, and transformed the underground shelter.
Very good, decisive, not holy.
It's great, let's make a sequel soon