Bakemonogatari

Basic points

The atmosphere in Nadeko's class is strained, and as class rep, she's been pressed to do something about it.
She calls Koyomi for advice, after which the serpent tells her to go to the shrine, whereupon it presses her, as the perpetrator (Nadeko Snake), to atone for what she caused by finding some remains of the snakes she killed.
She tries not to involve Koyomi this time, but he finds her at night* and takes her to his house. She manages to hide what she's doing from him.
Er...Shinobu prevents them from sleeping on the same bed, and later, has a short conversation with Nadeko when Koyomi passes out, telling her that it's only because she (Nadeko) is cute that she stirs up protective feelings (in Koyomi). "Are you lucky that you happen to be cute."


In the morning, Nadeko wakes with Karen beside her, and they chat about appearances, falling in love (ren'ai) and Koyomi having a GF, which Nadeko knew about before.
Nadeko feels resentment about Hitagi, ends up snapping at her teacher and her class, and leaves school early.
The serpent tells her that the remains are at the Araragi house, so she goes there and rummages through Koyomi's room. She finds his porn mags and reads 3 of them, and the bookmark turn out to be the remains.
The serpent tells her that, as a reward, it'll grant her a wish... Unsurprisingly, she wants Koyomi to like her back, but is told that it isn't possible.
Koyomi returns, and cautions her to put the ofuda down, but because of misunderstanding and Shinobu's provocation, Nadeko eats the ofuda and turns into a kaii.


Turns out that the serpent this time was just Nadeko being delusional, as she's been going crazy since she found out that Koyomi had a GF (she found out at the start of second semester, i.e. end Aug/early Sep).
Since the Nadeko Snake incident, she's been visiting that shrine.
When she met Ougi, there was no god at that shrine, so Izuko entrusted Koyomi with an ofuda which would become a god.
Since that day, Nadeko has lied to Koyomi about being able to see the serpent, and actually planned to be found by Koyomi that night* so that she could steal a key to his house.
The ofuda (the bookmark) was what she was looking for the next day.
(this is the true situation)

=> the last bit I summarised before.

Nadeko tries to kill Koyomi, but then his phone rings. It's Hitagi, who tells Nadeko to kill her instead, but the latter says she'll kill them all. So Hitagi tells her that the order is important, because if Koyomi dies, Shinobu will return to being the legendary kaii-killer, so Nadeko will have to kill Hitagi, then Shinobu then finally Koyomi. Furthermore, if Nadeko's killing intent is certain ('eternal') rather than impulsive, Hitagi asks her to wait until after graduation.

edit:
"If we'd met under different circumstances, Senjougahara-san, perhaps we'd have become friends."
"Definitely not." "No offense, but Sengoku Nadeko-san, I dislike/hate cute brats like you more than (I hate) the me of the past."

The very last scene has Nadeko welcoming Koyomi, Hitagi and Shinobu at the (snake) shrine in March.

"Koyomi-onichan, I'll give you all my affection, ok?"