Convenience store owner Candy faces operational difficulties, then accidentally discovers her back door connects to three worlds: the apocalypse wasteland, the Cultivation Realm, and the elven magic world. Goods from the three worlds are highly complementary — waste from the apocalypse is valuable Spirit Stones in the Cultivation Realm, old artifacts from the Cultivation Realm are powerful sacred artifacts in the magic world, and herbs from the magic world can cure deadly apocalypse viruses. She starts a zero-cost cross-world reselling business, pays off all debts and eventually becomes the richest person. Apocalypse Commander Gideon grows from her business partner to her life partner. When the ultimate doomsday crisis arrives, Candy unites the power of all three worlds to end the apocalypse, and the gold she obtained in exchange for a bottle of cola eventually brings the entire world back to rebirth.
