Nadeko is Tsukihis childhood friend who was always reserved, kept her eyes downcast, had long bangs covering her face, and possessed a shy demeanor. She easily amused and wore a waist pouch. Koyomi played with her during his visits to his sisters' house. Nadeko referred to him as "Koyomi onii-chan" and showed affection towards him.
She was cursed two times by a classmate who liked the boy she rejected, and the rejected boy. While the first one had been banished, Koyomi is forced to battle the second to keep it from killing Nadeko.
Eventually, Kaiki resolves the situation by reminding Nadeko that her identity is not fully defined by her unrequited love, and that become a mangaka, one of the dreams or hopes of Nadeko revealed in this arc, is also a reason for Nadeko to move on past her unrequited love and to move on with life. Nadeko complied.
Nadeko reveals her true colors: an obsessive, egotistical, manipulative and cynical girl who because of her unrequited love had resorted to becoming a destructive deity enshrined as a god in North Shirahebi Shrine. Her immaturity of thought gave her the desire to kill Araragi, the object of her unrequited love.
Nadeko is an "ex-god" in North Shirahebi Shrine as Mayoi Hachikuji has been enshrined. She speaks like a tomboy, drinks copious amounts of alcohol and has rude mannerism in this arc, confirming the boyish and brattish side of Nadeko as a part of her real personality. It is also revealed that Nadeko had regretted this part of herself.
The arc was revealed as a decoy made by Nadeko herself to push to blame of turning into an oddity onto a scapegoat of a wristband she called "Kuchinawa", maintaining her act of being the victim. Her obsession with her forelocks was also shown to be an allusion of how she hides her true self by appearing as a hapless and cute girl.