High school senior Koyomi Araragi discovers a shocking secret one day after helping his classmate Hitagi Senjougahara—a secret he is never to tell.

Koyomi takes Hitagi to consult Meme Oshino, the wandering expert on supernatural oddities. Meme provides advice to them on exorcising apparitions.

Uncomfortable after quarreling with his sister on Mother’s Day, Koyomi leaves the house. Hitagi bumps into him at the park and makes an offer.

Koyomi and Hitagi meet a girl named Mayoi Hachikuji in the park. She seems to be lost and cannot find her way home. The two try to help her.

An apparition is behind why Mayoi is unable to reach her mother’s house. Receiving advice from Meme, Hitagi tells Koyomi the surprising truth.

On his way to Hitagi's house, Koyomi bumps in to Suruga Kanbaru, the school's basketball star and an old friend of Hitagi, of whom he can't get rid of. Later that day, Koyomi is attacked by a mysterious being.

The day after his attack, Koyomi goes to see Suruga, where she tells him something about herself he can't quite grasp.

Koyomi takes Suruga to see Oshino in order to help her. However, the help he offers isn't the help Koyomi wanted...

Tasked by Meme, Koyomi heads to a lonely temple to attach a prayer slip. There he sees a dead snake that has been severed into five parts.

Koyomi taps into Meme’s powers in order to lift the snake’s curse from Nadeko Sengoku, a mysterious girl he encounters at the temple.

The five girls' problems with supernatural beings have been solved, and it's now summer break, with the culture fair over. Koyomi Araragi has two little sisters, self-proclaimed "heroes" nicknamed the Fire Sisters, Karen and Tsukihi.

Temptation haunts Koyomi, while visiting Sengoku he is presented with several tempting offers. After surviving each one, his visit to Kanbaru continues to put him in compromising situations.

Araragi leaves Kanbaru's house and meets a dangerous man named Kaiki. While following him, he runs into Senjougahara, who berates him for skipping his studies.

Karen is badly ill, having been poisoned by an evil, supernatural bee. Will Koyomi be able to cure her in time?

Koyomi learns the whole story about what happened between Karen and Kaiki. After receiving a tempting offer from Hanekawa, he speaks with Shinobu on the way to save Karen.

Koyomi leaves Karen behind at home to talk with Senjougahara. Senjougahara seems to be planning on confronting and murdering Kaiki. When he comes back home, he learns Karen has wandered off, while still sick.

Araragi goes to confront Kaiki and stop him from leaving the city. But Kaiki is wiley and smart, and not easily dissuaded when there's money on the line.

Karen is acting clingy and very cute, completely out of character. But its a trick to get Koyomi to introduce her to Kanbaru. In response, he devises a test Karen must pass; a test involving her toothbrush.

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.

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.

On August 20th, Koyomi Araragi left his home to deliver to Mayoi Hachikuji something she had forgotten, but was unable to find her. He realized he had not done any of the homework he was supposed to do, yet tomorrow was already the term opening ceremony.

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."

After succeeding in changing the destiny of Hachikuji, Koyomi Araragi and Shinobu Oshino returned to August 21st 11 years in the future. There, the two of them find out that their original world had been completely annihilated.

Shinobu Oshino realizes that humanity had turned into zombies thanks to the powers of Kiss-shot. Koyomi Araragi shoots up fireworks as an SOS signal, but instead they are surrounded by zombies. However, an unexpected individual arrives at the scene...

Nadeko Sengoku's classmates are all strained thin due to the “hocus-pocus” of con artist Deishu Kaiki. Because of that, Nadeko goes to school every day with a heavy heart; but one day, she starts seeing white snakes all over the place.

Koyomi and Ougi find themselves trapped in a classroom, and the story shifts back to the point when Suruga introduces Ougi to Koyomi. Ougi approaches him with a mystery about a room not seen in the school's blueprints for them to investigate. When they enter the room, they find themselves trapped inside, leading them to their current situation. While talking about their predicament, the duo realize that the room is an oddity created by a traumatic memory from Koyomi's freshman years. Koyomi then tells Ougi that two years prior, the class president at his and Hitagi's class at the time, Sodachi Oikura, was looking for possible culprits of cheating on a math test, and would not allow any student to leave class until a culprit was found. Ougi surmises that they themselves won't be able to leave the room until the two-year-old mystery is solved.

In the aftermath of the previous day, Araragi is about to enter his classroom when Hanekawa informs him that a student absent all year is finally attending. The story pushes further into the past, as more of “what” makes Koyomi Araragi is revealed.

Having rediscovered the room on the second floor of the ruined house, Koyomi tells Ougi of the events that happened there five years earlier.

Hanekawa reveals her concerns about Ougi as she and Araragi go to visit Oikura.

Araragi and Hanekawa visit Oikura and learn the painful story of her family's past.

Ougi claims to have figured out the whereabouts of Oikura’s mother and, in her own way, helps Araragi and Hanekawa to solve the mystery.

Koyomi Araragi waits in the ruins of the cram school to ask Suruga Kanbaru for help, a request he hopes she will refuse.

After a hurried departure from the cram school ruins, Koyomi and Suruga head toward the meeting place, only to encounter some difficulty along the way.

Having finally arrived at the meeting place, Koyomi and Suruga find an unexpected person waiting for them. Before their reunion can take place, they must face an unexpected foe!

The group relocates to the North Shirahebi Shrine where Izuko Gaen tells them the story behind the location and the effect Shinobu's first minion had on it.

Yotsugi Ononoki has been infiltrating the Araragi residence to keep an eye on Tsukihi Araragi. While Tsukihi is at school, Yotsugi freely spends her time, but she is seen by Tsukihi, who suddenly comes back home.

In order to become a manga artist, Nadeko Sengoku doesn't go to school and spends her days drawing. So, her parents finally tell her to start working after graduating from middle school. As the deadline until graduation approaches, Yotsugi Ononoki proposes ways to become a manga artist.

Together with Ougi Oshino, who says, "I saw Nadeko in uniform," Nadeko Sengoku arrives at 701 Middle School, a public school, where she was sighted. Despite her anxiety, Nadeko stepped into the school. The scene she witnessed was unexpected.

Inspired by her conversation with Sodachi Oikura, Nadeko was heading to the Araragi residence to secure Meek Nadeko. However, there was a big hole around the knob of the front door, big enough for a human wrist to pass through. Meanwhile, Yotsugi, who had gone in the other direction to look for God Nadeko, was heading toward North Shirahebi Shrine.

Nadeko and Yotsugi returned to the Sengoku residence to plan a strategy for the future. Unable to take a step forward, Nadeko ponders how to secure the rest of the Shikigami Nadekos, prompting Yotsugi to remind her of her original purpose. To settle the situation and achieve their objectives, the two headed to the place for the final battle.

With the help of Yotsugi Ononoki, Nadeko Sengoku finally met God Nadeko. In front of God Nadeko, who had a creepy smile on her face, were the two "Current Nadekos." After that, the place Nadeko heads to in order to end the story is the location where Koyomi Araragi used to be.

Suicide-Master, who woke up from starvation, was told by Tropicalesque that the cause of her death was "the Beautiful Princess." Intrigued by her tale, Suicide-Master goes out to find "the Beautiful Princess" to have her as a first meal out from her slumber despite Tropicalesque's warning.

Suicide-Master, who still keeps dying, realizes that consciousness reform is needed for both the one who eats and the one who gets eaten. She watches Princess Acerola try her best to change with a smile, but Tropicalesque has a thought for his master.

Koyomi Araragi visited the hospital led by Izuko Gaen. What he saw there were two mummies lying in bed, and both of them were still alive. Izuko and Koyomi, wanting to solve this case, receive a new report that another mummy has been sighted.

Five members of the women's basketball club at Naoetsu High School go missing. According to Suruga Kanbaru and Seiu Higasa, that's not the only problem. Koyomi takes on this case and searches for the missing people with Izuko.