Kizumonogatari is a Japanese supernatural light novel series by Nisio Isin, serving as the prequel to the Monogatari series. It follows Koyomi Araragi as he becomes entangled with a powerful vampire, Kiss-shot Acerola-orion Heart-under-blade, and is transformed into a vampire himself. The story explores his struggle to recover his humanity while confronting dangerous vampire hunters and the consequences of his choices. It is known for its stylized dialogue, striking visuals, and darker tone compared with the main series.