中禅寺先生物怪講義録　先生が謎を解いてしまうから。

The Mononoke Lecture Logs of Chuzenji-sensei: He Just Solves All the Mysteries

Our setting is in Tokyo in 1948, just right after the war. Kanna Kusakabe had just become a second-year at a high school when she meets the new language teacher, Akihiko Chuuzenji. Mysterious supernatural things keep happening around Kanna. Once again today, Kanna is going to open the doors to the library prep room to seek help from the surly Chuuzenji-sensei who is waiting inside. A high school supernatural mystery featuring the unlikely duo between a teacher and a high school girl is about to begin! (Source: Pony Canyon, edited)