One night, Nakazaki Yuuya, a self-proclaimed worrywart and coward, adventures the school at night because he had forgotten his phone, only to be spooked by a spirit called Tenko. Unable to comprehend what was even happening, Yuuya could only listen to the spirit’s words as she floated above him.

“Congratulations. From this moment onward, you are now one of us—One of this school’s Seven Mysteries.”

With that as the starting point, Yuuya would rely on the powers of the other Seven Mysteries to solve various incidents happening at the school, until eventually, his fate intertwines with a girl from his class—

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