Reborn Prepper's Heat Bunker

Zane Lowe is reincarnated, with only seven days remaining before the global Extreme Heat Cataclysm erupts. He decisively blackmails his supervisor, sells his assets and takes out high-interest loans, stockpiles emergency supplies to build an underground bunker. When the apocalypse arrives, those who once ridiculed him come begging for survival, only to be coldly rejected. However, the extreme heat is just a prelude, and the true apocalypse is only just beginning to take shape.