"I don't know anything. You're the one who knows... Officer Araragi."
Cracking down on a "rumour" before it can turn into a ghost story. Police officer Koyomi Araragi has begun working at the Hearsay Department of Naoetsu Station. Hitagi and Tsubasa, who have left town.
What paths have the three have chosen after turning 23 years old... and what feelings will Koyomi convey in the end...?
As one knows more, the more you find things you don't know.
These are the modern-day oddities! Oddities! Oddities!
For all time, these hearts in love cannot be unbound.

(Source: Kodansha, translated)