Kizumonogatari Part 1: Tekketsu

Japanese anime based on the novel by Nisio Isin. After befriending Tsubasa Hanekawa (voice of Yui Horie), Koyomi Araragi (Hiroshi Kamiya), a student at Naoetsu High School, learns of the existence of vampires and meets one when he discovers Kiss-Shot Acerola-Orion Heart-Under-Blade (Maaya Sakamoto) dying in the aftermath of an attack by vampire hunters. She gives Koyomi the chance to save her by giving her his blood, but his sacrifice transforms Koyomi into her vampire servant, duty bound to help his new master hunt down her attackers.