Shinjo Yuji.

He's just an ordinary high school boy.

But one day, while commuting to school by train, a magic circle appeared as if to designate the car he was riding in.

And what's more, for some reason, another magic circle appeared solely beneath his feet.

Seeing this, his heart pounded with the expectation that an even more special story awaited him.

Before long, a light so brilliant he couldn't open his eyes filled the space―――

――――When he came to, he found himself alone, left behind in the train car.

"…Huh?"

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