Class Teacher System - Chapter 100，Part 2: Save the apocalypse (6.2)

Side story of Kyoukai Senjou no Horizon bundled with the first press release of the 1st, 3rd, 5th and 7th Blu-ray volumes of both seasons of anime.

This side story follows Asama, Kimi and Mitotsudaira aboard Musashi one year before the beginning of the main story, as Asama is considering to create a music band together with her two friends for the next festival in Aki, a territory under the governance of K.P.A. Italia.

One Hero Is Not Enough To Save The World.

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Amael, the hero, singlehandedly wiped out more than half of the entire demon race all on his own and even won against the demon king. This should have put him at ease but unfortunately for the human race, the demon king and his race were fated to come back to life again after thousands of years, just like it's always been.

“You may have won this time Amael, but the next time, there'll be no one as powerful enough as you to save this world” the demon king cackled with a malicious laughter as he faded away.

“This is only a temporary peace...”

“Very well then... If this is what I must do to completely eradicate them, then I will”

Amael then made a decision. A decision he had hoped would ensure the safety of the future for generations to come.

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“We were supposed to be dead, but when we both woke up, we found ourselves in this new world... a world that was all too familiar to both of us”

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Cayena, the Imperial Princess, was known as the most beautiful woman in the Empire. She was a woman who knew nothing but evil and luxury.

However, she was destined for ruin: she would be used as a chess piece by her younger brother to secure his throne and killed by her crazy husband.

“I’ll make you the Emperor.”

“… Sister, are you referring to me?”

“In exchange, give me freedom.”

She had to change things before she became that Cayena.

[This is your typical story where there is a System of unknown origin given to mankind, and the existence of Towers, Dungeons, and Constellations, the known or unknown ‘Gods and Demons’ of humanity’s collection of myths.]

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— Ding!

[Astronomical Event!]

An event called 'Emergence of Races' struck the human world where the planet Earth was stretched out like dough causing it to become seven times its original diameter.

Various Towers and Dungeons sprouted out of nowhere that caused an earthquake that broke the seismic scale.

Billions of humans died in the process that crumbled human society in an instant.

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And just like that, Russell Moon reincarnated in the world of his-considered-failure unpublished novel [The Forgotten Swordsman of Ruined Star], sixteen (16) years before the beginning of the ‘Main Story’ which was set forty (40) years after the Emergence of Races.

And due to that very reason, the existence of 'Untouched and Unknown elements' came back to bite him!

'Why did I write that way?'

Russell Moon lamented.