If you think you know your own skin, what would you do if it suddenly started to change, and you didn’t have control? That’s the first thing Haruto Yakamura asks himself on the night of September 16th, 2027, as he stares at the oozing cluster growing on his left arm. He’s a second-year in high school, known for avoiding crowds. He’s never drawn attention, and he likes it this way, but something’s about to drag him out of hiding.
The school was fine in the morning. Haruto even scored a surprise on his end-of-term math quiz, and Risa Morikawa – who most see as the ghost-girl of 2A – even gave him a strange smile when their eyes met. He still hasn’t managed to say more than three words to her.
By lunch, though, there’s a tight itch that burns from his palm to his bicep, hidden under his jacket. He slinks away from the cafeteria, leaves his meal untouched, and so begins his secret: each finger pressed to his skin sends tiny jolts, as if he’s touching live wires. A single blue-veined line inches from his wrist to elbow like roots clawing into dirt. Have nightmares from real life ever stalked you? For Haruto, it’s not a dream.
Like any stubborn teen, he tries to ignore it. Of course, it doesn’t work by late afternoon. In practice, Haruto zones out in gym class, nearly crashes face-first during warmup sprints, and ends the day realizing his uniform digs in where he’s swelling up. Maybe you’ve felt the heat in a limb swelling during a fever? Multiply that by fear.
After school, Risa grabs him by the sleeve near the back stairs.
“You feel it too?” she whispers, fingers trembling. For a moment, he nearly screams. She rolls up her sleeve and shows a jag of raised, shifting flesh dancing on her forearm.
“Don’t let them see,” she says. “Mrs. Tada’s shadow swapped, and I think her teeth moved.” Good horror doesn’t wait for belief to catch up.
The city begins to rot from the inside. News breaks of sickness across their ward. Strange faces; people with glossy redness staring at pale, loose jaws in store windows. The hospital begs for help on TV, even as doctors in bandages hide hands under their coats. Some med students vanish with entire makeshift gurneys from the ER.
Home again. Quiet, before screaming. At seven ten, Haruto’s mother tries to pull him from toilet stall with a gentle thud on the door. When he emerges half a minute later, the mass on his arm pulses – there’s a small bone curling like a serpent beneath open, shocked skin.
Ten seconds of eye contact and she just sighs and walks away, dead-eyed. Roles flip overnight, don’t they? Can a fifteen-year-old still count on his parents to stay themselves?
Haruto finds Risa that night outside Kasamatsu Pharmacy, rains slick, food wrappers piled mid-street. She’s there, bright green jacket glinting rain, and there’s another lemon-yellow tumorous node on her shoulder, stitch marks peeking through as if someone tried to zip her muscle. With few words, Haruto helps her up. They run, heading for school’s third floor, dodging three patrol drones watching their shadows.
Inside their empty Art Room, they reach Kaede Minori. She’s found with arms wrapped in muddy belts of gauze; salt crystallized in the window says she hasn’t left in days. Kaede stares out past to score-marked glass, voice quiet: “They won’t tell us the cause. But my dad, he…his leg sprouted a jaw. Now he’s not talking.” Kaede’s sketches are a horror field. One panel shows cuts on her legs stuffed with rose thorns. Was anyone immune? Who decides ordinary students suffer while adults fade out?
Team forms. Risa’s weird itch lets her sense when someone near will mutate further. Kaede, using pain as drive, maps how changes spread through bone and tissue on her tablet. Yet Haruto secretly worries his change is fastest. Crooked digits shift in and out near his elbow when anger hits. Why is his heart beating off-tempo?
They launch online rumors about a hidden lab set up below their city library, tying times of growth to tracked packages going underground. Risa points out every odd van she’s noticed for the week. Safe in the storage closet at 2:30am, they swap lines: “It’s growing,” “Nothing fits anymore”, “Hurts more at night.”
Suddenly, their phones get a maddening alert–a video leaked of Councillor Iwata at his desk smiling at camera, eyelids shuddering separate from his face. “You think he’s human right now?” Kaede challenges. “Who made the video?” Haruto chants to himself, not to them: if he’s learning to live with his new shape, must he fear becoming a monster? What if the only way to survive is to go along?
Before dawn, as the group gathers in a huge storage vent to break open floor plans, the silent town starts drumbeats from hollow pipes outside–a signal or warning? Through the cracked glass, Haruto’s fingers start splitting again, bits of bone blooming up, ropey veins along both arms. Risa catches him before he claws his own shoulder open.
The cliffhanger cuts deep: At 4:14am the sirens start city-wide. The team huddles silent, skin breaking in slow blossom, as doors break in below them, and the next wave of twisted impostors – neighbors and teachers? – pour into the night. Would you flee if this first change hits you, or fight to understand the body you’re growing into?
