During Koyomi Araragi's sophomore year at Naoetsu Private High, he stumbles upon Tsubasa Hanekawa, the class's top honor student. She wore her pristine uniform, eyes bright. While exchanging pleasantries in the hallway, Hanekawa drops a chilling rumor: a vampire with gleaming blonde hair and frosty eyes has been sighted prowling the town's streets.
Grateful for a new acquaintance, Araragi brushes off the story and spends the rest of his evening in conversation with classmates. They laughed over cafeteria gossip, and he felt belonging. But as he walks home, he notices a trail of crimson splashes descending the stairwell toward the subway entrance. Curiosity compels him to follow the blood into the station's depths. The air grew colder, and a faint metallic scent lingered.
At the source, he is horrified by what he sees—the blonde vampire herself, utterly dismembered. When she pleads for help, Araragi must decide whether to intervene, a choice that could reshape future forever.