Associate Professor Akira Takatsuki's Conjecture

After closing the case on the eerie mystery of 4:44, the professor and his intrepid intern investigate reports of mermaid sightings in a seaside town. As Professor Akira would be quick to explain, not all mermaids are gentle beauties— and as Fukamachi can prove, not all mysteries are built of lies… And their adventures don’t end there, as a lead from the past soon sends them tumbling into the candlelit terror of the Night of One Hundred Horrors!

Professor Akira’s scary story party became a strange tale itself when a ghostly voice was caught on the recording equipment—now it falls to the professor and Fukamachi to resolve the mystery of the Night of One Hundred Horrors! And Fukamachi’s summer has more in store, with Akira accompanying him to Nagano. There, they will learn the secrets of the festival of the dead that Fukamachi saw on the muggy summer night of his youth that changed his life—and his ears—forever!