Certainly! Shinobu's backstory is a major part of the Monogatari series and is explored in depth throughout the various seasons and arcs. Here are some key points about her backstory:

- Shinobu was originally a powerful vampire named Kiss-Shot Acerola-Orion Heart-Under-Blade, who was feared and revered by humans and other vampires alike.

- However, after a series of events, Kiss-Shot became weakened and was on the verge of death. She encountered a young man named Koyomi Araragi, who offered to help her in exchange for becoming a vampire himself.

- Kiss-Shot agreed to the deal, but after turning Araragi into a vampire, she abandoned him and disappeared. This event had a profound impact on Araragi's life and led to his involvement with other supernatural beings.

- Over time, Kiss-Shot's personality changed, and she became more reclusive and melancholic. She eventually changed her name to Shinobu and began living as a shadow of her former self.

- Throughout the series, Shinobu's backstory is explored in greater detail, and we learn more about her motivations and the events that led to her current state. Her relationship with Araragi is also a major part of her backstory and is a key element of the series as a whole.