While out, Koyomi Araragi encounters Tsubasa Hanekawa, whose face is covered with a bandage. Koyomi learns what has been happening in the Hanekawa family, but Tsubasa begs him not to tell anyone, saying she'll do anything to keep him quiet.

Koyomi pays a visit to Meme Oshino, who asks him how Hanekawa has been lately. Meme tells Koyomi to go immediately to confirm Hanekawa's safety. Koyomi heads to Hanekawa's house, only to find... So begins the nightmarish nine days of Golden Week…

As the Sawari Neko continues attacking victim after victim, rumors begin spreading around town. In the midst of this, Koyomi encounters the Sawari Neko once again and learns why it attacks people and what its ultimate intentions are.

Though the Sawari Neko warns Koyomi, "If you want to help my master, stay out of my way," Koyomi begs Shinobu to lend him the apparition-killing sword called "Kokoro Watari." With it, Koyomi formulates a secret plan and goes to defeat the Sawari Neko.

As Shinobu explains how Tsukhi came to be in her currents situation. Araragi is resolved to stop the out of Towner's from killing her. But unlike Oshino and Kaiki, Kagenui speaks with her fist and she talks a lot.

Araragi agrees to take Shinobu on a trip to buy doughnuts. At the restaurant an old acquaintance, that should not be there, is able to give information on the towns new visitors.

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

Karen is acting clingy and very cute, completely out of character. But it's a trick to get Koyomi to introduce her to Kanbaru. Fearful of what Kanbaru sexual proclivities, he devises a test Karen must pass; a test involving her toothbrush.

Araragi goes to confront Kaiki, but first he has to deal with his sister. When he finally gets her to go home and get some rest, he now has to stop Kaiki from leaving the city. But Kaiki is wiley and smart, and not easily dissuaded when there's money on the line.

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, Karen is missing. She's wandered off, while still sick.

Koyomi learns the whole story about what happened between Karen and Kaiki. After receiving a tempting offer from Hanekawa, he speaks with Shinobu on a way to save Karen. It might prove to be too radical of a solution.

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

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.

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

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. What "fake" beast does Karen confront? What supernatural creature of the holy grounds, whose power surpasses even a vampire, has Tsukihi absorbed?