Sensory Swap System in Doomsday

The heatwave apocalypse arrived without warning, sending global temperatures soaring into uncharted territory.

As the power grid collapsed across the country, the government rationed electricity, leaving household air conditioners dead. Millions fell victim to severe heatstroke, their bodies cooking from the inside out.

I had spent my life savings on a small, portable cooling tent. Due to power limitations, it could only fit one person at a time. My family and I agreed to take turns, one day at a time.

But by the second day, they stole my turn.

First, they gave my slot to my younger brother.

Second, they gave it to my mother.

By the third day, I died of heatstroke.

When I opened my eyes again, I was back in my bedroom, exactly one week before the world went to hell.

This time, I woke up with the Sensory Swapping System.

The first thing I did after my rebirth was shut down every assembly line at my food processing plant. I took all the rice, flour, grain, and oil from the factory and locked them away in our storage vaults. With the apocalypse looming, raw survival depended entirely on securing resources.

Checking the countdown on my phone, I had exactly six days and seven hours before global temperatures spiked by thirty percent, scorching crops and drying up rivers. At that point, anyone with food and water would become a prime target.

Simply having supplies was not enough; I needed an absolute fortress.

My top priority was upgrading the factory. I expanded the main warehouse, installed an independent solar power grid, and dug deep to place a heavy-duty underground water filtration system. Every production line was cleared out, and raw ingredients were categorized and secretly moved into cold storage and reinforced vaults. Finally, I hired a high-end security firm to install a defense system.

With my safe house ready, I turned to the remaining supplies.

I rented a twenty-four-foot refrigerated box truck. It was large enough to haul my entire checklist, yet modest enough to navigate the city streets and enter the factory gates without drawing suspicious eyes. More importantly, it kept temperature-sensitive cargo perfectly chilled during transport.

I bypassed local supermarkets and wholesale markets, which were too crowded and lacked the bulk items I needed. Instead, I drove to a massive warehouse club on the city outskirts and bought vacuum-packed rice, flour, grains, frozen meats, and canned goods in bulk.

I cross-referenced my checklist to make sure no detail was missed: antibiotics, painkillers, anti-inflammatories, gastrointestinal medicine, antihistamines, and wound disinfectants.

Once the medical supplies were secured, I cleared a small indoor plot inside the factory. As soon as my first truckload arrived, I sowed vegetable seeds into the fertile soil. There was no telling how long the heat would last, and relying solely on stockpiles was a death sentence. I needed a continuous, renewable source of food.

By the time I finished my second supply run, my bank accounts were drained.

Running a private factory meant most of my liquid capital was tied up in unpaid invoices, so I liquidated my stock portfolio and sold my family's ancestral home far below market value. With the cash, I covered the factory roof with high-efficiency solar panels, adding several industrial-grade diesel generators capable of running for years. I also purchased an encrypted military-grade radio transmitter, multiple thermal imaging cameras, and a state-of-the-art automated defense system.

Six days later, the heatwave struck.

My external sensors registered a blistering 119 degrees Fahrenheit. And I knew this was just the beginning.

The municipal power grid collapsed within four hours of the initial spike. The city fell into a suffocating silence. Water systems rely on electricity; when the pumping stations ground to a halt and the last drops trickled out of the taps, raw panic tore through the streets.

I unlocked my phone, watching the desperate cries for help online and tracking real-time aerial footage from my drone. The once-bustling streets were completely abandoned. The asphalt was melting, bubbling up and releasing a pungent chemical stench.

As my drone hovered over my old apartment building, I spotted three familiar faces through the window.

"It's too hot! Why isn't the AC working?"

"I'm going to die!"

My brother's whining voice filtered through the audio receiver.

Watching the three of them drenched in sweat, I reached into my mini-fridge, grabbed a cold can of soda, and took a long, refreshing drink. The icy liquid slid down my throat, sending a pleasant shiver through my body. It actually felt a little chilly, so I adjusted my thermostat to a comfortable seventy-eight degrees.

By the third day, the temperature outside hovered near 140 degrees. Reports of heatstroke deaths were skyrocketing, and vicious fights over bottled water were breaking out on every corner.

Unbothered, I pumped filtered water from my well and gently misted the green sprouts pushing through the indoor soil.

But as I stood enjoying the quiet, my security console flashed a bright red warning: [Bio-signature approaching].

Through the high-definition security monitors, I watched two men carrying heavy fire axes kick through my outer factory gate.

"The air is cooler in here! There's definitely food inside!"

On screen, their faces were twisted with heat exhaustion and manic desperation. I recognized them instantly. In my past life, these same two men had looted a local convenience store during the initial blackout, hacking the elderly shopkeepers to death for a single case of bottled water.

They began hacking at my security doors, cursing and screaming. Their violence only made my decision easier.

Since I had spent millions on an automated defense grid, I figured this was the perfect opportunity to test it. I moved my finger across the console and tapped the [Purge] command.

A silent laser swept across the hallway. The two intruders collapsed instantly, blood pooling on the concrete. Within seconds, automated cleaning arms emerged from the wall, dragging the bodies toward the incinerator chute.

I launched my drone to scan the factory perimeter. The location was remote enough that no one else seemed to be nearby. But as the drone returned toward the main hangar, three figures caught my eye.

"Mom, Dad, this is where Sylvia is hiding!"

"That selfish bitch is in there enjoying the AC while we're out here dying!"

I had fully expected Gavin to drag our parents to my door eventually. But what I did not expect was the sudden alert on my monitor: [Main Door Unlocked].

The sound of my security system disengaging made my blood run cold.

How was that possible? The security architecture was my own design, featuring physical and digital barriers. Without my master biometric override, opening the door from the outside should have been impossible.

I pulled up the lock diagnostics. The primary electronic lock icons were flashing red, showing they had been bypassed.

Zooming in on the entryway camera, I saw Gavin holding a strange, custom-built electronic device. He was running it over the keypad, forcing the system to cycle through codes. I had forgotten that despite his lazy, useless attitude, my brother was a mechanical prodigy when it came to locks and circuits.

I took a deep breath, my fingers flying across the auxiliary control panel. I had engineered this system to handle any threat, including an inside betrayal.

I initiated the secondary lockdown protocol. I wiped the digital keypad memory and engaged the heavy steel physical deadbolts.

[Authorization required: Iris scan, palm print, thirty-six-digit dynamic physical key.]

[Processing security protocol... 3... 2... 1...]

[All external digital signals blocked.]

The moment the physical bolts slammed into place with a heavy thud, Gavin's face fell. He kicked the door in frustration, triggering the automated defense warning. Realizing what would happen if he stayed, he grabbed our parents and retreated into the courtyard, screaming curses into the security camera.

I assumed they would wander off and perish in the heat, but two hours later, they returned.

This time, they were dragging someone with them.

It was Martha, my oldest factory employee. She had been with me since I started the business, treating me like her own daughter. In my previous life, I had lost contact with her during the chaos. In this life, with time running short, I had anonymously sent her a massive crate of supplies and a stack of cash, urging her to escape to the countryside.

How did they find her?

"Sylvia!" Gavin screamed at the camera, holding a kitchen knife to Martha's throat. "If you don't open this door, I'm going to carve this old lady up piece by piece! You have three minutes!"

The temperature outside was rising. Sweat poured off my family as they counted down the seconds, their eyes wild with desperation.

In the final seconds, I relented. I put on my tactical body armor, gripped my rifle, and opened the inner security gate. "Let Martha go, and you can step inside," I announced through the speaker.

But I underestimated their cruelty.

The moment the cool air of the vestibule hit their skin, Gavin kicked Martha hard in the stomach, sending her sprawling. Before I could catch her, the three of them rushed past us into the primary safe room and slammed the door, locking it from the inside.

I didn't panic. I simply smiled, helped Martha up, and led her into the secondary shelter next door.

Fortunately, I had designed the factory with a dual-zone layout. By locking themselves in the primary room, they had only cut off a tiny fraction of the facility, leaving the storage vaults and greenhouses entirely under my control.

But as the minutes ticked by, the air in my secondary room began to warm up. I checked the monitors and saw Gavin frantically pressing buttons on the master panel, cutting the power to my section of the building.

The suffocating heat of my past life began to creep back into my chest.

On the split-screen monitor, I watched Gavin tearing through my refrigerator, guzzling my cold drinks while my parents submerged their heads in the sink.

I pulled up the system interface on my tablet.

[Sensory Swapping System activated. Please select target.]

Without hesitation, I typed in my brother's name: Gavin.