300 Nen Buri no Chikyuu ni, Nake

In 2030, World War III breaks out. By spring 2031, Russia declares war on Japan. Japan joins the Allies in the conflict, but things quickly spiral out of control. The war finally ends in 2035 after America launches nuclear missiles.

The result? Earth becomes unlivable due to radiation. Humanity finds hope in a new planet called Tellus.

In 2060, humans finish moving to Tellus. But how did humanity manage to relocate so quickly—just 25 years after the war ended? It's a taboo topic on Tellus.

Fast forward to 2359. Ren Ariwara is an orphan living at "Koropokkur Kotan." He's obsessed with Earth and hated by everyone around him. Recently on Tellus, more and more "Earth fanatics" like Ren have appeared—people who idealize Earth's past and technology.

One day, Ren is falsely accused of hacking into a British-area server and sentenced to exile back to Earth—a punishment set for one year later. Secretly wishing they'd just execute him instead, Ren soon learns he's not alone: seven other high-school students were also sentenced to exile.

Meanwhile on Tellus—a planet that's become as rotten as a filthy public toilet—strange things are happening: protests, coups, Earth-return movements... and eventually World War IV.

As their exile approaches, Ren and the others grapple with questions: Why exile to Earth? Who framed them? Who are they really? How will humanity survive from now on? Which planet—Earth or Tellus—is their true home?

Everything will be decided by war.