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

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...

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.

Nadeko comes to thank Koyomi, and the two geek out over a shared interest. Tsubasa Hanekawa passes by and suddenly complains of an acute headache.

Koyomi is over the moon when Hitagi announces their first date will finally happen. But on the day of, he finds that she is not the only one there.

Tsubasa suffers from an inexplicable headache. Koyomi rushes to meet Tsubasa at the park, and learns of her paranormal situation.

Meme is not himself these days, caused by Shinobu’s disappearance from the house. Koyomi, Mayoi, Suruga and Nadeko all search for Shinobu.

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.