Associate Professor Akira Takatsuki''s Conjecture is a mystery light novel series centered around mystery and school life.>

Klappentext

A FAMILY AFFAIR.Takatsuki's estranged cousin Yuuto reaches out for the first time in decades. Apparently, a growth has appeared on his fiancée's shoulder-and it's taking the shape of a face! The moment he and Naoya meet her, she addresses Takatsuki as "Tengu-sama" ... Then, on their web page, they receive a request from someone who lives at a traditional Japanese inn. The client is a nineteen-year-old girl who claims that when she was a child, her mother was sucked into a mirror... Will the supernatural wonders never cease?

Zusammenfassung
Takatsuki's estranged cousin Hiroto reaches out to him. Apparently, a growth has appeared on his fiancee's shoulder-and it's taking the shape of a face! But the moment they meet her, she yells "Master Tengu" and runs over...! Then, on the website they use to collect stories, they receive a request from someone who lives in a traditional Japanese inn. The client is a 19-year-old girl, and she claims that when she was a child, her mother was sucked into a mirror... Will wonders never cease?