Trên đường đến nhà Hitagi, Koyomi tình cờ gặp Suruga Kanbaru, ngôi sao bóng rổ của trường và là bạn cũ của Hitagi, người mà anh ấy không thể thoát khỏi. Cuối ngày hôm đó, Koyomi bị tấn công bởi một sinh vật bí ẩn.

Một ngày sau khi anh bị tấn công, Koyomi đến gặp Suruga, nơi cô ấy nói với anh ấy điều gì đó về bản thân mà anh ấy không thể nắm bắt được.

Koyomi đưa Suruga đến gặp Oshino để giúp cô ấy. Tuy nhiên, sự giúp đỡ mà anh ấy đưa ra không phải là sự giúp đỡ mà Koyomi muốn...

Được Meme giao nhiệm vụ, Koyomi đến một ngôi đền vắng vẻ để đính kèm một tờ giấy cầu nguyện. Ở đó, anh ta nhìn thấy một con rắn đã chết bị chặt thành năm phần.

Koyomi mượn sức mạnh của Meme để hóa giải lời nguyền của con rắn khỏi Nadeko Sengoku, một cô gái bí ẩn mà anh gặp ở ngôi đền.

While taking Karen to meet Kanbaru, Araragi is put into a compromising position. On the way, he runs into someone asking about familiar things.

Araragi agrees to take Shinobu on a trip to buy doughnuts. At the restaurant, an old acquaintance is able to give information on the town's new visitors.

As Shinobu explains how Tsukihi came to be in her currents situation. Araragi resolves to stop the out-of-towners from killing her. But unlike Oshino and Kaiki, Kagenui speaks with her fist and she talks a lot.

Koyomi Araragi begins the day by being rudely awoken by his sister, Tsukihi. He decides to discuss love with her, asking how one can tell if they are in love or not. It turns out that recently, he can't stop thinking about his classmate, Hanekawa Tsubasa. Later, he runs into Hanekawa, who reveals a shocking fact which he may not tell anyone else about.

Later, Araragi meets up with Oshino Meme, who quizzes him about Hanekawa. He reveals everything except the secret he was sworn not to tell, including finding and burying a silver cat with no tail. From this, Oshino warns that Hanekawa may have been possessed by an Oddity, the Curse Cat. He instructs Araragi to find Hanekawa, whilst he looks for the shallow grave they dug for the silver cat. Araragi finds Hanekawa, but things then take a turn for the worse...

Araragi, initially ignoring Oshino's warning not to involve himself any further in this incident, visits Hanekawa's house and is shocked by what he finds. He returns home and convinces his sisters not to involve themselves in the Curse Cat incident either. A few days pass and Hanekawa is still nowhere to be found. Araragi returns to Oshino to find him severely injured from his numerous encounters with the Curse Cat. Later, Araragi manges to find and talk to the Curse Cat occupying Hanekawa. Calmer and less violent now, she tells him to leave her to her own devices in order to relieve her master's stress.

Araragi begs Shinobu for her help, which she eventually provides. He then formulates a plan to confront the Curse Cat and save Hanekawa.

The first day of the second trimester, Tsubasa Hanekawa chats with the ghost girl Mayoi Hachikuji en route to school. Right afterwards, she witnesses a giant “tiger” apparition. Later that day, her house completely burns down from a fire.

Worrying about Tsubasa Hanekawa as she lost a home to return to, Hitagi Senjyogahara allows the girl to spend the night at her place. Tsubasa eats a meal prepared by Hitagi and wakes up together with her.

Suruga Kanbaru, an underclassman, came to visit Tsubasa Hanekawa now that she has resumed attending school. Apparently, Koyomi Araragi has asked for Suruga's presence tonight. Tsubasa returned to Hitagi's house without knowing what was going on.

At Hitagi Senjyogahara's discretion, Hanekawa Tsubasa ends up living under the roof of the Araragi residence. Spending an evening in Koyomi's house, Tsubasa realizes that she had turned into Black Hanekawa the previous night.

Tsubasa determined the identity of the giant tiger apparition “Kako,” and writes one long letter. The letter was addressed to Black Hanekawa, the apparition that could be described as her other personality.

Koyomi and Shinobu unexpectedly time warped back to May 13th 11 years ago. Koyomi thinks of saving Mayoi Hachikuji, who was “destined to become a ghost after getting into a traffic accident on her way to see her mother the next day – Mother's Day."

A recap episode retelling the events of Bakemonogatari from "Hitagi Crab" to Nadeko Snake", narrated by Koyomi. One day, Koyomi Araragi caught the body of his classmate Hitagi Senjyogahara, who was falling down after slipping on the stairs, knowing that it was dangerous to do so. However, her body was surprisingly light, as if the concept of weight did not exist.

A recap episode retalling the events of Bakemonogatari's Tsubasa Cat and the entirety of Nisemonogatari, narrated by Koyomi. During the summer vacation after all the apparition-related incidents around the five girls have been resolved, Koyomi Araragi's two risky younger sisters – the self-proclaimed heroes of justice, Karen and Tsukihi – become involved in some trouble.

Koyomi returned from the time warp with Shinobu. From North Shirahebi Shrine, he headed home together with Mayoi Hachikuji and returned her backpack to her. However, right afterwards, the two of them are assaulted by a mysterious “Darkness.”

With the help of Yotsugi Ononoki, Koyomi and Mayoi were able to escape from the “darkness.” Within the ruins of the cram school that they escaped to, Shinobu is consulted about the “darkness.” She starts to speak of what happened 400 years ago.

Koyomi finishes hearing the story about 400 years ago from Shinobu. Yotsugi joins them at the spot, and Mayoi wakes up from her slumber. The four of them were talking within the cram school ruins, but the “darkness” appears a second time at that location.

Koyomi and company climbed down the mountain they were hiding in after escaping from the “darkness." Upon visiting a village between the mountains, they meet Izuko Gaen and receive an explanation concerning the “darkness.”

After the graduation of Araragi and Senjougahara, Suruga alone to deal with her left hand that has been turned monsterous from her mother's monkey paw charm. After hearing rumors of a "Devil" that can solve one's problems no matter what, Suruga set out to find this person.

After having her hand healed, Suruga has many questions for her former classmate Rouka. She was unable to contact her, however a meeting with Keiki Deshu, who seems to have survived the attack from the previous season, answers some questions of hers.

Suruga realizes that the collector is in fact Rouka, and she has been collecting parts of the "devil" as she feeds off the misfortune of others. Her motives are questionable...

Rouka challenges Suruga to a one-on-one basketball match as the two discuss the events that led up to their collection of their respective "devil" parts. Suruga is still coming to terms with the ability to use her left arm again.

Upon finding the Demon's head, she meets Rouka once again. Instead of giving the head to Rouka, she refuses. She is unable to stand the sight of her because of the fact that she can see her as she is a ghost. Suruga then challenges Rouka to one-on-one basketball in a wager for the head if Suruga loses.

Koyomi Araragi and Shinobu Oshino discuss the true nature of Shikigami doll Yotsugi Ononoki, and Koyomi is being rudely woken up by his sisters who tell him to cram for his upcoming college entrance exams.

Koyomi Araragi sees that he has no reflection, and discusses this with Shinobu. She then suggests that Koyomi should see Yozuru Kagenui and Yotsugi Ononoki.

When Yotsugi tells Koyomi that he is indeed becoming a vampire, Koyomi reasons that using his vampiric powers must have come with a price. Yozuru tells him that while there is no way to undo the progress of his transformation, there is a way he can stop it from progressing further: he must no longer use his powers as a vampire. However, this turns out to be quite a challenge when he learns his sisters and Suraga have been kidnapped.

Koyomi and Yotsugi land at the base of the mountain, where they are surprisingly met by Ougi Oshino. She talks with Koyomi for a while about his current situation and his upcoming confrontation with Teori. Koyomi and Yotsugi begin their journey up the mountain.

March 13th, the morning of college entrance exams. Koyomi Araragi has died due to Izuko Gaen. Mayoi Hachikuji was waiting for him in the afterlife, and guides him towards an unknown destination. Koyomi would have never thought that this certain someone would be waiting for him there.

Mayoi takes Koyomi to meet Teori, who offers him a way to return to the world of the living. Koyomi is in doubt about accepting his offer, as he believes others like Mayoi are more worthy of reviving than him, until he comes with a surprising decision.

Now fully human again, Koyomi is called by Hitagi for a date, as they spend some time together, Koyomi has a vision of Ougi.

Koyomi and Hitagi spend the rest of the date bonding further. Once back home, Koyomi has another encounter with Ougi.

Gaen assembles Koyomi, Shinobu, Mayoi and Yozuru and reveals that Ougi is the responsible for some of the previous ordeals they faced.

To stop Ougi from meddling further, Koyomi has a final confrontation with her.

After being exposed, Ougi is about to be engulfed by the darkness, but Koyomi refuses to give up on her and Meme reappears in the nick of time to save them.