Associate Professor Akira Takatsuki’s Conjecture, Vol. 2 (light novel)

Naoya, a university student who can infallibly detect lies, embarks on another investigation into mysterious phenomena with his eccentric professor, Akira Takatsuki.
Their latest client claims that they’ve contacted the spirit of a missing classmate while playing the Kokkuri fortune-telling game. Afterwards, a famous actress comes to Naoya looking for advice about ghosts, and more of Takatsuki’s enigmatic past comes to light!