Birthday: July 7th
Weight: 99 lbs
Senjougahara is a smart, athletic, and witty person, but she has a great deal of trouble showing any vulnerability to anyone because of a difficult, complicated childhood. Senjougahara's family was very wealthy until she fell deathly ill. In response, her mother fell in deep into a cult, which slowly tore the family apart. Her mother also gave a high ranking member of the cult into her home with the intention of letting him have his way with Senjougahara, although Senjougahara foiled the attempted rape by injuring her assaulter with a spiked shoe. Her mother left the family in deep debt, and Senjougahara deeply scarred.
In her first year of high school, she encountered a spirit called the Stone Weight Crab, which took her 'weight', both figuratively and literally. It took her burdensome memories of her childhood, and left her weighing only five kilograms. As she couldn't remember the reason why it took her weight, she and her father entertained a series of con artists promising to fix the problem but only left Senjougahara embittered and emotionally distant. It was several years until she met another high schooler named Araragi Koyomi, who introduced her to another specialist, Oshino Meme, who helped her confront the crab, and regain her weight, including the memories that came with it.