Associate Professor Akira Takatsuki's Conjecture, Vol. 7 (light novel)

ENTER AT YOUR OWN RISK!A Seiwa student comes to Professor Takatsuki and Naoya looking for advice. She recently accompanied her fellow club members to a building where the elevator was rumored to transport its passengers to another world, and the next day, someone from their group vanished without a trace. Next, Professor Takatsuki and Naoya receive a request from Naoya’s old mentor and head deep into the mountains of Tochigi. There, they find themselves at a construction site where mysterious events plague the workers attempting to seal the marshland below. However, according to legend, the marsh is home to an entity known as Nushi-sama…