Nadeko, the main character of Nadeko Snake, is Tsukihi’s friend back in elementary school. She always wears a waist pouch, always casts her eyes downward, has her bangs covering her eyes, has a shy personality, and can be easily amused. Koyomi played with her a lot whenever she visited his house after being invited by his sisters. She was put under a curse and was going to die until Koyomi found out and offered her his help. She refers to Koyomi as Koyomi-onii-chan. She's quite protective of her hair (particularly her forelocks) thinking that it's her place to guard more than her panties. When she finally combed her forelocks aside in Nisemonogatari, Koyomi commented that she has a glare just like a serpent. In Nadeko Medusa, during Halloween, Nadeko met a girl named Ougi, and after which she was able to see a white snake. In Nadeko's class, the atmosphere is strained because of the curses that happened in Nadeko Snake, and since Nadeko is the class rep, she's been pressured to do something about it. She called Koyomi for advice, and after which, the serpent told her to go to the shrine, where it pressures her, as the snake wants her to atone for what she caused by finding the remains of the snake when it was alive. She tries not to involve Koyomi, but he manages to find her at night and takes her to his house. She wakes up next to Tsukihi and managed to bring up the topic of Koyomi's girlfriend, in which Nadeko feels resentment toward Hitagi and ended up snapping at her teacher and to her class. The serpent then tells Nadeko that its remains were in Araragi's house so she goes there and rummages Koyomi's room. She found Koyomi's hidden magazines and saw that the bookmark was the remains. The serpent tells her that, as a reward, it'll grant her a wish and unsurprisingly, she wants Koyomi to like her back. Koyomi returns and saw what she was doing and cautioned her to put the bookmark down. Because of misunderstanding and some of Shinobu's provocation, she then eats the bookmark and becomes an oddity. It 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 girlfriend. Nadeko then tries to kill Koyomi, but Hitagi interferes and asks her to wait until after graduation. The book ends with Nadeko welcoming Koyomi, Hitagi and Shinobu back at the snake shrine in March, with Nadeko saying: "Koyomi-onichan, I'll give you all my affection, OK?". In the official guidebook, Nisio Isin did an interview with all of the voice actors, and asked Kana Hanazawa on what character she would like to play, in which Kana Hanazawa replied that she'd like to play an evil character, probably becoming the basis of Nadeko Medusa. It seems Hitagi and Shinobu both dislike Nadeko. The story will continue in Hitagi End.
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