Tomoyuki Itamura

The black swindler Kaiki Deishu, who once deceived Hitagi, returns to town and spreads the incantation which cursed Nadeko before. Koyomi's sisters Karen and Tsukihi try to capture Deishu but... (myanimelist.net)

Koyomi Araragi is a student who has recently survived a vampire attack, with the help of his friend Tsubasa Hanekawa. Now, he finds that she has been possessed by an oddity called the Curse Cat, and is now attacking people, including her parents. He must now find a way to help get rid of the Curse Cat. (myanimelist.net)

Suruga Kanbaru continues to attend Naoetsu High School, even though her beloved upperclassmen Hitagi and Koyomi do not attend anymore. While training one day, she hears the rumor of the Lord Devil, a figure that is said to be able to grant any wish. Although she was afraid that it might be herself, she finds that the person playing Lord Devil is Rouka Numachi, one of Suruga's middle school classmates. (myanimelist.net)

"Please!--Do it, and get it over with." Slowly but surely, Koyomi Araragi, who "has been averting his eyes from reality," has no choice but to face it. February comes, and the college entrance exam is approaching. What is this "change" that is happening to his body that cannot be overlooked? The "Monogatari" begins to sprint towards its conclusion. This is Oddity taking place in the modern world! In a story of youth, a word of farewell is inevitable. (myanimelist.net)

During the month of October of his third year in high school, Koyomi Araragi is introduced to a transfer student named Ougi Oshino by his underclassman Kanbaru Suruga. Ougi tells Koyomi that she has something she wishes to consult with him. When she draws the map of Naoetsu High School, she finds something peculiar. This discovery reveals a tale that wasn't meant to be told, and this makes Koyomi's high school life totally different. This is the story that brings to light "what" makes Koyomi Ara (myanimelist.net)

Kou Yamori is an average middle school student who struggles with grasping the complex concept of love. Because he sees little sense in surrendering to the norm, he soon stops going to school. Plagued with insomnia due to his idleness, Kou begins roaming the lonesome streets at night.

In each episode, Koyomi is presented with a mystery posed by one of the female characters from the story, which he then investigates on his own or helps them solve.