Associate Professor Akira Takatsuki’s Conjecture, Vol. 4 (light novel)

GHOSTS OF THE PAST Spring has come for Naoya, now in his second year of college. To Professor Takatsuki s delight, Naoya signs on for another year as his assistant, and it doesn t take long for the requests to start coming in! Strange things keep happening in an architectural office, and every occurrence seems to feature the number four. A weekly magazine puts out an article about a real-life mermaid sighting! But arguably the biggest mystery of all is the appearance of a dapper British gentleman on campus Wait, he s Takatsuki s uncle?!