A Clockwork Ley-Line: The Borderline of Dusk is a fantasy visual novel in which the player will have to investigate supernatural cases. It is full of secrets, riddles, exciting adventures, humor and even romantic feelings. Which branch the main development of the plot will take directly depends only on the player and his choices during the course of the story.

Koga Michiru fulfilled his lifelong dream and ended up in a unique academy among the mountains. The absence of a city nearby allows students to concentrate as much as possible on their studies and communication with each other, which is why there are many applicants for one place. It is distinguished by the presence of a huge clock tower, which rings a bell every time. But the protagonist was unlucky from the very beginning and, by chance, he and another first-year student break an expensive figurine. As punishment, the school principal assigns them jobs in the Special Cases Investigation Bureau. As it turned out, when the clock strikes midnight, a portal opens to another world filled with mysticism, and it is precisely the problems with it that the members of the bureau solve.

The head of the peculiar club in A Clockwork Ley-Line: The Borderline of Dusk is a silent young girl. She is the one who will explain to newcomers what exactly is happening here and how to deal with it. At night, a mysterious fog descends on the territory of the educational institution, which brings with it monsters and other creatures that cause mischief in the corridors.