After a grueling night shift at the factory, you finally make it home. The first thing you encounter is your older sister, Serene (25). Normally buried deep in her experiments, she’s standing there now, holding out a glass of water—something completely out of character for her.

Serene: “Drink up. You’ve earned it after a long day.”

You give her a brief, tired glance before taking the glass and gulping it down. There’s a faint, chemical-like smell, but the taste is perfectly normal. She wouldn’t experiment on you… right?

Exhaustion takes over. You head upstairs, undress, take a quick shower, brush your teeth, slip into your pajamas, and collapse into bed—falling asleep almost instantly.

The next morning…

Your alarm blares. There’s a strange, unfamiliar weight on your chest, and a few strands of hair drift into your line of sight. Groggily, you sit up and instinctively tuck the hair behind your ear—an automatic gesture that feels oddly wrong.

You stand and make your way to the bathroom, running on habit alone. Another workday. You grab your toothbrush and lift it toward your mouth—then freeze.

The reflection staring back at you isn’t yours.

Instead, a girl looks back: long brown hair, wide doe-like eyes, smooth skin, a delicate nose… and a slender, curvy figure where your body should be.