Reincarnated In Attack On Titan World As Nobody

Winter mornings always make it hard to leave the comfort of a warm bed. But reality is rarely so kind.

"Boom Boom Boom~~~"

A series of deafening bells echoed across the dormitory, followed by the sharp blast of a whistle. The sleeping recruits jolted awake, faces still dazed with sleep. But it didn't take long for the shock to settle—they weren't civilians anymore.

They were cadets now. Soldiers in training.

"Livingston, get up! You'll be late!" Ellis shook his friend urgently, eyes filled with panic.

The dorm supervisor's warning from the previous night echoed in his mind—latecomers would be forced to run five laps around the square.

One lap equaled one thousand meters. That meant five thousand meters as punishment. For anyone untrained, it might as well be a death sentence.

Everyone in the dorm scrambled into their clothes in a frenzy. The air was thick with the rustle of fabric, muffled curses, and the clatter of boots hitting the floor.

Watching the chaos, the dorm supervisor shook his head in disappointment.

This had to be the sloppiest batch of recruits he'd ever seen.

Well—except for one.

His eyes drifted to the neatly made bed beside Livingston's. The cup and pillow were perfectly arranged. The recruit assigned there had already been there for more than an hour before the wake-up call. Dressed in full uniform, he had left the dorm on his own, grabbed a light breakfast, and headed straight to the training square.

He was probably still out there… running laps.

"Shin…" the supervisor muttered to himself, a mixture of admiration and unease in his voice. "What kind of fourteen-year-old pushes himself like that?"

He couldn't understand it. Not in this era of relative peace.

Meanwhile, at the square—

"Huff… Huff…"

Cold air stabbed at Shin's throat with every breath he drew. His lungs burned. Even for someone with his strength and stamina, running long distances in freezing weather was punishing.

Steam rose from his body like smoke from a forge. His uniform clung to his skin, soaked through with sweat. Each step grew heavier, his pace slower—but still he pushed on.

Finally, with a weary breath, he completed his final lap and slowed to a walk, trying to steady his breathing.

Just then, a familiar voice echoed in his ears.

"Ding! Winter running completed: 13,002.356 meters. Willpower +1. Endurance +1."

A satisfied smile crept across Shin's face.

Sometimes, people weren't afraid of hard work—they were afraid that hard work might not pay off. But for Shin, every drop of sweat had its reward. The system never lied.

He had long become addicted to that feeling: suffering first, then growing stronger.

From the corner of his eye, he noticed other recruits filtering into the square, most still groggy, some already staring at him like he was a monster.

That guy's a maniac.

Is he actually… enjoying this?

He's been running since before dawn… is he trying to kill himself?

Shin ignored them all.

He made his way over to Ellis and the others, greeted them briefly, then stood silently at attention, waiting for the instructor's arrival.

It wasn't Erwin who appeared. Instead, a tall, grim-faced man in an instructor's uniform strode into the square.

"I am Klaus Radner," he announced, his voice as sharp as a whip. "From now on, I will be in charge of your training. I expect discipline, endurance, and improvement from all of you."

His piercing gaze swept across the formation, pausing on the latecomers with open contempt.

"I'm already disappointed," Klaus said bluntly. "This is your first morning assembly, and so many of you are already late. Unacceptable."

"Five laps. Now. No breakfast until you finish. The rest of you—dismissed. Eat, and prepare for training."

With that, Klaus turned and left. But not before his gaze lingered on Shin for a few seconds, eyes narrow, as though measuring him.

So… Erwin gave him a heads-up, Shin mused. He watched the instructor walk away, his eyes settling on the shiny bald patch on Klaus's head. Shin instinctively reached up to pat his thick hair.

Glad I still have mine.

The late recruits groaned in despair and dragged themselves into their penalty runs, stomachs empty and morale low.

As the recruits scattered, the day's real training began.

The Training Corps was the primary source of manpower for all three military branches. Their regimen was famously grueling—yet everything they taught was essential.

Marching, physical conditioning, logistics, equestrian training, lectures on military tactics, hand-to-hand combat, swordsmanship, and—most importantly—3D maneuver gear training.

Without the ability to use 3D gear, a recruit had no place in the military.

That's why the first real test in the corps was always about balance and coordination—fundamentals needed to control the gear.

If a cadet failed to master the basics, they were cut from the program immediately. It was harsh, but necessary. The equipment was too vital for amateurs.

The tension among the recruits was thick.

One by one, cadets stepped forward for the balance test, nerves tightening with every fall or wobble.

Then, Shin moved to the front of the line.

Eyes followed him with a mixture of fear and awe.

This was the kid who had taken on dozens of recruits in a brawl and still walked away unfazed.

This was the kid who woke up before dawn to train in sub-zero temperatures.

Now, everyone would see whether his reputation held up when it truly mattered.

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