My Fortress, Their Apocalypse

Sloane Sutton transmigrates into a high-temperature apocalypse novel as the "Saint" protagonist, threatened by wicked neighbors. She foresees extreme heat, transforms her supermarket into a Doomsday Fortress, hoarding supplies. She takes revenge on Cole, "bestie" Lynn, and Agnes Miller, and saves doctor An Yi. She discovers the heat is an "Abyss" organization's weapon experiment. She leads a team to destroy the core device, ending the disaster, and establishes "Hope City".