Toaru Majutsu no Index: New Testament - Volume 18, Prologue: Connection Point - Destiny_Joint.

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

The character he raised was a completely useless one which couldn’t even be used to see the ending, in other words, a total failure.

Not impossible, but refused…? It was absurd for a moment.

He woke up in a strange swamp in the middle of nowhere. As the very loser he had raised. “…In the first place, I wasn’t downloading anything illegal.”

A dark era running towards destruction. A survival story of a complete loser in order to return safely.

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Kawaki, who was born in the dragon vein of a planet (Altana), first met Umibozu who was traveling in the universe, and his girlfriend, Kouka.Later, he came to Earth by accident and met the teacher who affected his life —Yoshida Shouyou.He also met a group of friends. The most conspicuous among the group of friends is a fool with silver hair and naturally curly hair, a short man with purple hair, and a little devil whose catchphrase is “Not Zura, it's Katsura!”Gintama Doujin, not transmigration.

The world has turned into a hell, a place where the strong thrive!