Protagonist: Rei Hijiri had graduated from high school and was preparing for university admission.

Without any warning, he was abruptly summoned, his soul alone, to another world: "Trinitas Mundus" (The World Forged by the Trinity of Heaven, Earth, and Man), the setting of a novel he himself had written.

His summoned destination was the body of a young holy knight named Ray Arklight, who had been transferred from a world a thousand years in the future.

Why was he chosen? For what purpose was he summoned?

Without any explanation, he was thrown into the world of his own novel and forced to live there.

Possessing knowledge of this world's laws, he lives alongside a female mercenary he coincidentally rescued, with a portion of his memories sealed away.

And, regardless of his own intentions, he becomes entangled in the fate of this world...

This is the story of the timid young man, Ray, as he grows with the help of those around him.

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Possessing an exceptional body and knowledge of this world, he is considerably overpowered. His magic is particularly strong, but due to his mental weakness, I don't believe this will be a story about an invincible protagonist.

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This shares the same world-view as "Dream Life."

Although the timeline differs slightly, the world setting is largely the same.

http://ncode.syosetu.com/n5465bn/

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It has been decided that this series will be published by TO Books.

(Volume 1 released on May 20, 2016; Volume 2 released on September 10)

Accompanying the publication, the title was partially changed on January 25, 2016.

(Former title: Trinitas Mundus)