Turn Left at the Fourth Floor, 100

Just an ordinary third-year college student, he only took a part-time job to earn enough money to buy a decent birthday present for the goddess he had a crush on. That was all. But who could have guessed that this would pull him into one chilling supernatural incident after another? It turned out the cleaning company wasn't cleaning this world. This seemingly peaceful world had long been hiding turbulent undercurrents, and a cataclysm was about to strike...

What exactly does Studio 100 do?

If it isn't cleaning this world, could it be... cleaning "that world"? Or, to put it plainly, does it specialize in handling supernatural incidents?

Then the case handler position must be...

And what is the story behind Yan Caiwei, the girl who can change clothes in the blink of an eye and teleport?

If a girl as capable as her is willing to work as Ye Sha's assistant, then what is Ye Sha's background?

I'm just an ordinary third-year college student. Why is Ye Sha so eager to recruit me?

Is this really fate calling me to take on a great responsibility? Am I not ordinary after all?!