Dual Transmigration to the Apocalypse: Starting With an Invincible Convenience Store

After going bankrupt and falling into debt, Du Ziteng unexpectedly activates a portal connecting two worlds. His convenience store is linked to a post-apocalyptic wasteland in the year 3000! He is absolutely invincible inside the store and can safely absorb power crystals with a 100 percent success rate. A bucket of instant noodles buys gold, and a spicy snack buys futuristic technology. In the real world, he builds a tech empire; in the wasteland, he establishes the human race's main city!