Chapter 8 The Century of Consequences.

When I returned to homeroom, the weight of yesterday’s lessons still lingered. Professor Takeda stood at the front again, his eyes calm yet piercing, as if measuring the readiness of each student. The afternoon sun filtered through the tall windows of Classroom 2-A, casting warm gold bars on the polished wooden floor.

Tadano leaned toward me, whispering. “History class for time travellers. Do you think he’s going to make us memorise dates?”

I whispered back. “Given this place? Maybe… But also anything could happen.”

Takeda then began his lecture: “Good afternoon. Yesterday we learned how to survive in ancient and medieval societies. Today, our focus is the twentieth century: industrialisation, war, and societal upheaval. This is no longer a world of distant empires or isolated city-states. Every action you take can ripple faster than ever. Some of you have been led to believe this class will be easy. A century as recent as the twentieth must seem familiar to you. Cars. Radios. Television. Wars you have heard of in school. Politicians whose names you already know.”

He paused, letting the silence expand.

“You are wrong. This century is the first in which humanity gained the ability to annihilate itself. It is the century where technology and ideology collided with such force and in such a short span of time that its echoes still shape the present day.”

He turned to the board and wrote three phrases in large, confident strokes.

1914 — The crisis in July
1939 — Fire on the Horizon
1990 — The Iron Curtain Falls

Takeda turned back to us.

“This class will not be a recounting of events. You will not memorise names for their own sake. Instead, you will learn why these events matter, and what a single intervention could alter.”

The murmurs around me quieted. Even the girl from Kyoto, Miyu Hayashi, looked more alert than annoyed.

“Let us begin with a man whose death changed the world.”

He dimmed the lights and pulled down the projector. A grainy black-and-white photograph appeared: a young man in a stiff military uniform, moustached, looking slightly uncomfortable.

Archduke Franz Ferdinand.

“The date is 28 June 1914. The place: Sarajevo. Within two hours of this photograph, the Archduke and his wife would be dead, and the world as they knew it would be over.”

He clicked again. A map appeared of Europe before the First World War.

“A single assassination should not cause a global conflict, and yet this is exactly what happened. Why?”

A few students looked ready to guess, but Takeda raised a finger.

“No. Before we dive into alliances or diplomacy, you must understand one thing: The twentieth century begins with momentum, not morality.”

The note of gravity in his voice made me sit straighter.

“The world was waiting for a spark. Industrialisation had made nations powerful enough to destroy each other quickly. Pride, paranoia, and imperial ambition had built a pressure cooker. And Gavrilo Princip, a nineteen-year-old with a pistol, lit the fuse.”

He stepped away from the projector and leaned against his desk.

“This moment is relevant to you, because you will one day walk among people whose smallest choices may alter the course of history. A misplaced word. A wrong gesture. A bump on a crowded street.”

His eyes swept across us, steady and unblinking.

“You must learn to recognise fragile points.”

He clicked again. A photograph of the devastated battlefields of the Western Front appeared. Mud, barbed wire, corpses.

A few students flinched.

“This is the world that followed twenty million dead. A generation scarred. And the stage set for an even greater catastrophe two decades later.”

Tadano muttered, but only loud enough for me to hear. “I didn’t sign up for this level of doom.”

Takeda continued without pause.

“Now let us examine the second turning point.”

The next slide appeared: a mushroom cloud blooming above a shattered horizon.

Hiroshima, 1945.

A hush swept through the room, deeper and heavier than before. Takeda folded his hands behind his back.

“Japan in 1945 had already lost the war. The decision to drop the atomic bombs is still debated by historians, politicians, and moral philosophers. But here, in this institution, our concern is different.”

He turned to us fully.

“We ask: What happens to time when a weapon makes the future uncertain?”

No one spoke.

Takeda nodded approvingly.

“This moment changed everything. From this point on, the destruction of a city, something previously requiring the departure of a thousand planes, could be done at the drop of a hat. So after 1945, the world entered a new era. One where caution and calculation outweigh courage and conviction. Nations began living not year by year, but second by second, watching clocks that measured not hours, but the likelihood of catastrophe.

He clicked again.

The Cold War. 1947–1991.

A map covered the screen, continents split into stark red and blue blocs that seemed to pulse under the projector’s hum. The room settled into a quiet focus.

“The twentieth century is defined not only by conflict, but by tension. A geopolitical stand-off unlike anything before it. Two nuclear superpowers circling each other like beasts in the dark—never striking directly, yet always ready to.”

He tapped the remote. The next slide appeared: photographs of proxy wars, missile silos, and terrified civilians huddled around radios.

“Wars fought indirectly,” he continued. “Nations torn apart not because of their own quarrels, but because they happened to sit on the fault lines between ideologies. And all the while, the world held its breath, waiting to see whether a miscalculation… or a misunderstanding… would be the spark.”

Takeda moved to the next slide.

1989 — The Fall of the Berlin Wall.

Crowds cheering. People standing atop concrete, tearing down barriers with hammers and bare hands.

“This is the century’s sigh of relief. Empires collapse. Nations reunite. For a moment, a brief moment humanity believes it has outrun its own past. That history itself had ended.”

He shut off the projector and stepped forward. “Now we begin the true lesson of this class.”

He picked up a piece of chalk and drew a line across the blackboard, clean and deliberate.

Cause → Reaction → Cascade

“These three words will determine your survival.”

He tapped the board lightly.

“Cause. A spark. An assassination. A misguided speech. A technological breakthrough. A natural disaster.”

He tapped the second word.

“Reaction. Diplomatic strain. Military action. Social upheaval. Public fear.”

He tapped the final word.

“Cascade. A war. A revolution. A collapse. A new world order.”

He faced us again.

“You are time travelers. You will walk through eras balanced on the edge of catastrophe. The twentieth century, more than any before it, reacts violently to interference.”

A gust of wind rattled the windows.

“Let me make this clear,” he said, his voice suddenly sharp. “If one of you is careless, the world could burn decades too early. If one of you is reckless, you could erase nations before they are born. If one of you is sentimental, you may save a life that collapses a government. This is why we study this century. Not because it is recent. But because it is fragile.”

Takeda placed the chalk neatly on the tray and folded his arms.

“You will not be allowed to travel before the year 2000 until this course is complete. And even then, you will be restricted to observation missions only.”

A few groans rippled through the class. One student, Saki, whispered, “What’s the point of training if we don’t get to do anything?”

Takeda heard her.

“The point is to prevent you from becoming the spark you fail to recognise.”

Saki shrank in her seat.

Takeda paced slowly along the front of the room.

“To demonstrate the volatility of this century, we will look at three hypothetical interventions. Pay attention.”

He held up a finger.

“Scenario One: You prevent the assassination of Franz Ferdinand.”

He paused.

“The First World War will still occur… But delayed, and waged with even deadlier weapons. The nations involved will be more prepared. The death toll will be greater.”

A second finger.

“Scenario Two: You sabotage the Manhattan Project.”

He let the weight of the words hang.

“The war in the Pacific continues for months, perhaps years. The Soviet Union expands deeper into Asia. Europe is carved differently. The Cold War began in 1947, or in 1952, or not at all.”

A third finger.

“Scenario Three: You warn the East German authorities that the Wall is about to fall.”

He shook his head.

“You cannot stop a collapsing dam by replacing one stone. The Soviet Union would still fall. But the manner of its fall, the speed of its collapse, and the violence surrounding it would be far worse.”

Silence enveloped the class.

Takeda nodded slightly, satisfied.

“This is the essence of the twentieth century: it resists interference. It punishes ignorance. It rewards precision.”

He looked at each of us in turn.

“You will learn where you can walk, and where you must never set foot.”

Then suddenly the bell rang. A ripple of relief fluttered across the room.

Once the bell stopped ringing, Takeda sat down behind his desk. “All right, everyone. For tomorrow’s class, we will be doing a written assignment. The assignment is simple. In about 400 words, describe how you would act and behave if you were stationed in the 20th century for about a week. Class dismissed.”

The moment the teacher stopped talking, we gathered our things and left the class. As we filed out, I glanced back. Takeda stood alone in the dimming room, arms folded, staring at the words on the board.

Cause. Reaction. Cascade.

The twentieth century, I realised, wasn’t a history lesson. It was a warning.