First season of the Monogatari Series, part 3/6. Contains the arc Koyomi Vamp from the Kizumonogatari light novel.
 
In the spring of his second year of high school, Koyomi Araragi met the beautiful vampire Kiss-Shot Acerola-Orion Heart-Under-Blade. Koyomi saved Kiss-shot, who was on the verge of death with all four of her limbs cut off, but only at the expense of becoming her minion and a vampire. “In order to go back to being a human again, you must take back all of Kiss-shot’s limbs.” After receiving advice from Meme Oshino, an expert in the supernatural, Koyomi prepares to go into battle.
 
Awaiting him are three powerful vampire hunters—Dramaturgy, a giant vampire hunter who is a vampire himself. Episode, a half-vampire who wields an enormous cross, and Guillotinecutter, a quiet man who specializes in killing vampires. Will Koyomi be able to take back Kiss-Shot’s limbs from the vampire hunters? Amidst the soft spring rain, the curtain rises on this fateful blood bath…
 
(Source: Aniplex)