My Selfish Sister: A Second Chance at Retribution

My sister and I were unexpectedly given a choice between two systems.
One was the Amplify System, which could make anything 100 times bigger. The other was the Shrink System, which could make anything 100 times smaller.
My sister, Jessica, smiled and chose the Shrink System. That left me with the other one.
Three days later, the apocalyptic rains began. The entire world was trapped indoors, unable to move, and resources became the single most critical issue. Using the Amplify System, I enlarged our meager supplies, and by rationing carefully, my sister and I managed to survive the ordeal.
But the day the rains stopped, Jessica pushed me from the roof of our high-rise apartment building.
"If you hadn't stolen the Amplify System from me, I could have made enough food to save Leo and his family!" she had screamed, her face twisted with rage. "You're a good sister in every way, Kathreen, except for one thing. You're just too selfish!"
When I opened my eyes again, I was back in that moment of choice. Jessica, moving a split second before me, chose the Amplify System. Thats when I knew. She had been reborn, too.
I smiled. Using the Shrink System, I shrank enough food to last me five years, and then I shrank myself.
And just like that, I vanished from the world.

1
"Please select your system."
The words, the scenewhy was it all so familiar?
My mind was still foggy. Wasn't I just pushed off a building by my sister? A dizzying sensation of falling washed over me before I finally snapped back to the present.
Jessica seemed just as stunned, but only for a moment. She lunged forward, her voice sharp with decision. "I want the Amplify System!"
A disembodied voice echoed in our minds. [Affirmative. The Amplify System is now bound to you.]
She shot me a triumphant look, her eyes shining with unconcealed glee.
Thats when it hit me with absolute certainty. I had been reborn. Reborn to the exact day my sister and I were given our systems.
I sneered inwardly. If you love your precious Leo so much that youd murder the sister who saved your life, then fine. This time, I wont be lifting a finger to help you.
Seeing Jessicas ecstatic expression, I said calmly, "Then I'll take the Shrink System."
[Affirmative. The Shrink System is now bound to you.]
Jessica was already eager to test her new power. She picked up a nearby cup and focused. In an instant, the small cup swelled into a massive, oversized mug.
"Wow, it's real! The Amplify System is really mine!" she squealed.
I watched her with cold detachment. This was the sister I had protected with my life.
In my past life, when the apocalyptic rains hit, trapping everyone in their homes, supplies became dangerously scarce. I used the Amplify System on the few cases of instant noodles and bread we had, stretching them out to survive the five-year deluge.
Jessica's childhood crush, Leo, lived in the apartment across the hall. She had begged me to help his family, to enlarge their food, but I refused. In an apocalypse, I told her, you couldn't trust anyone.
Without my help, Leos family didnt last five years. They starved to death early on.
I survived the apocalypse, only to be murdered by the very sister I protected. The irony was laughable.
"Kathreen, the Amplify System is mine now. Aren't you jealous?" Jessica asked, a sly glint in her eye. "I can make anything I want bigger. Your Shrink System seems kind of useless, doesn't it?"
She was testing me, trying to see if I remembered. Her gaze was sharp, laced with suspicion.
I let out a relaxed breath and forced a casual smile. "What's the difference? It's just a system. If you wanted it, you can have it. I don't really care."
Seeing my complete lack of interest in the Amplify System, Jessica finally relaxed, her smile genuine now.
I knew, without a doubt, that this time she would save Leo and his family. And I also knew that the moment anyone else found out about her system, her life in this new world would be in constant danger. Everyone would covet a power like that.
Jessica excitedly ran out of our apartment and knocked on Leo's door.
"Jessica? What are you doing here?" Leo asked, looking confused.
She immediately linked her arm through his, ignoring the flicker of annoyance on his face. "Leo," she said with a sugary sweet smile, "let's talk inside..."
The moment their door clicked shut, I pulled out my phone. The date glared back at me. The 14th.
Three days until the storm hits.
There was still time. I grabbed my car keys and sped to the nearest supermarket, clearing the shelves of everything I could get my hands on. Non-perishables like instant noodles and bread, essentials like toilet paper, combs, and mirrors, and comforts like blankets and pillows. I bought sacks of rice and flour, packets of every kind of vegetable seed imaginable, and, on a whim, a crate of live baby chicks. I even went to a furniture store and bought an entire matching set for a new home.
I was going to build myself a perfect, tiny sanctuary.

2
My apartment was on one of the highest floors, high enough that even in my past life, the rising floodwaters never reached it. I had no plans to leave my home. I was just going to live in it a different way.
I went on a frantic shopping spree, draining my bank account to the last cent.
Jessica, on the other hand, was completely unconcerned. Knowing the storm was coming, she made no preparations at all. With her Amplify System, she figured she could make a single loaf of bread last forever. She was actually looking forward to the apocalypse.
I knew why. She was dreaming of becoming the hero who saves her beloved Leo and his family from starvation, earning his eternal love and devotion. I always knew she had a crush on him, but I never realized she was such a lovesick fool.
That night, she came home floating on a pink cloud, looking like shed already spent the day swimming in the ocean of love with Leo.
"Kathreen, if I saved Leo's familyhypothetically, of coursedo you think he'd fall in love with me?" she asked, her face glowing with a shy, hopeful blush.
"No," I said coldly.
"That's impossible! He'll definitely fall for me!" she retorted, her tone suddenly sharp. "Just admit it, you like him too, don't you? But you're two years older than him, so don't even think about it!"
I ignored her, my head bent over my phone as I ordered the last of my supplies online. She had already killed me once. I wouldn't let it happen a second time.
This time, you can die on your own.
"Hey, Kathreen, do you have any money left? Can you lend me a few thousand? I want to buy some snacks," she asked, her voice wheedling.
"No," I said, my face a mask of stone. "I just bought a new refrigerator. I'm broke."
Her voice turned into a shrill shriek. "Why would you buy a refrigerator?!"
I frowned. "I wanted a new one. Is that a problem? Why are you overreacting?"
Realizing her mistake, she quickly smoothed over her expression. "Oh, no reason! I was just curious, hehe," she giggled. "By the way, Kathreen, I remember you had some snacks in your room. I hope you don't mind, but I already gave them to the lonely old folks in our building. They have it so tough, you know? You're not mad, are you?"
She beamed at me, as if expecting me to praise her for her kindness.
I couldn't believe it. Reborn with the system she always wanted, and her first move was to give away my last remaining supplies. She was actively trying to kill me. If I hadn't been reborn, if I didn't have a system, I would have starved to death in the coming apocalypse.
Looking at her bright, innocent smile, my disgust for her deepened.
I thought I had been a good sister. Our parents died when we were young. As the older one, I shouldered the responsibility, dropping out of school to put her through her education. I never blamed her for her poor grades. I always made sure her allowance was far more generous than her peers', money I earned through back-breaking work. When she failed her college entrance exams, I had already managed to buy this apartment. I brought her here to live with me.
But then she reconnected with Leo, her childhood friend who lived across the hall. They had played together as kids, but his family had moved away after receiving a huge payout for their land. The moment Jessica saw the now-handsome Leo, she fell head over heels, chasing after him relentlessly.
Even in our past life, when I refused to help his family, she had secretly given them a third of our precious supplies behind my back. All I could do then was lock our door tight to prevent theft.
It was clear now. In my sister's eyes, I was worth less than a man who had never done a single thing for her.

3
I was done with her. "It's fine," I said.
She smiled and hooked her arm through mine. "Hehe, you're the best, Kathreen! I knew you wouldn't get mad over something so small!"
I pulled my arm away. "I'm a little tired. I'm going to bed. You should get some rest too."
I retreated to my room and began to finalize my plans. I had also purchased a small wind turbine generator, which would provide a steady stream of electricity during the storm. All my preparations were complete. Now, all I had to do was wait.
Jessica, confident in her Amplify System, used her pocket money to buy a few hundred dollars' worth of food and locked it in her room, as if she was afraid I would steal it.
I had already decided to abandon the apartment I had worked so hard to buy. No matter how small I became, if I stayed in the main living area, there was always a chance they could find me.
So I chose another place.
The secret room inside my bedroom.
It was a small, hidden room I'd had built during renovations, a space I had never told Jessica about. It was no bigger than a walk-in closet, but for a shrunken me, it would be a perfect safe house. The door was controlled by an app on my phone. I had no fear of her finding it, and even if she did, she could never open it.
As a final preparation, I had driven ten miles out into the wilderness and used my system to shrink a large plot of fertile soil. With that and my seeds, I could grow my own vegetables and be completely self-sufficient. I also shrank a few small trees and brought them back with me.
Within a day, all my orders arrived. There was now only one day left until the storm.
I had everything delivered to our old, abandoned family home in the countryside. The village had been deserted for years. The house was now piled high with furniture, appliances, food, and all sorts of other supplies. When no one was around, I used the Shrink System to shrink everything down and pack it into a large suitcase I had prepared.
At the last moment, I hesitated, then shrank the little house itself and brought it with me. It was old, but with a little work, it would be a cozy home.
Late that night, I drove back to the city and moved everything into the secret room. Jessica was so giddy with her own preparations that she hadn't even noticed my comings and goings.
The secret room was already equipped with an air filtration system, so I wouldn't have to worry about oxygen. I left five large bottles of mineral water unshrunk, pouring them into a small basin to serve as my future water source. I installed lights that I could also control with my phone.
After a full night of careful arrangement, the secret room had been transformed into a miniature farm. The chirping of the tiny chicks was barely audible as they pecked for insects in a small patch of grass. Just beyond the farm stood my little house, complete with every modern convenience.
Now, finally, I could rest. I was ready for the storm.

4
During the last half-day of peace, Jessica went over to Leo's apartment again. His family didn't seem to like her much, but she didn't care, making a beeline for his room as usual.
I'd overheard Leo's mother complaining to the other women in the building more than once.
"That girl from across the hall has no shame. She's a grown woman, and she's always running into my son's room. So improper."
One of the neighbors had joked, "Looks like she's got a crush on your son! You might be getting a daughter-in-law soon!"
Leo's mother had scoffed. "Please! You don't know? She couldn't even get into college. She's in her twenties with no real job, just mooching off her sister all day. A poor girl like that wants to marry my son? No way! My Leo is tall, handsome, and has a good job. She's not even in his league."
I had heard it all and said nothing.
There was one hour left. I called Jessica.
"Hello? Kathreen, what's up?"
"Something came up at work," I said, my voice flat. "I'm working overtime tonight, so I won't be back."
She hesitated for a second, but offered no warning about the impending storm. "Okay, I'll eat by myself then. I'm hanging up."
Hah. I knew she wouldn't tell me to be safe. My call was just a ruse anyway, to make her think I wasn't home.
Using my phone, I opened the secret door, slipped inside, and sealed it behind me.
Then, I used the Shrink System one last time. This time, the target wasn't an object. It was me.
A wave of dizziness washed over me, and then my perspective shifted dramatically. The once-cramped secret room now felt like a vast, open world.
I was willing to take this risk because of something I had observed in my past life. After the rains stopped, everything I had enlarged with the Amplify System had miraculously returned to its original size. I gambled that the Shrink System would work the same waythat it would deactivate when the apocalypse ended.
Looking at my plot of land, my trees, my chicks, and my little house, a profound sense of peace filled me. I was finally free from the storm.
While Jessica was out, I had installed hidden cameras in the apartment and the hallway outside, all linked to my phone. I could watch everything. For good measure, I even put one outside Leo's door. The cameras were top-of-the-line, with crystal-clear images and audio.
With everything in place, I tucked my phone into my pocket, shouldered a tiny hoe, and began to till my land.

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