Kizumonogatari Part 1: Tekketsu

Follows Araragi's encounter with the vampire Kiss-shot Acerola-orion Heart-under-blade and his journey back into humanity from being a vampire.
One day, Koyomi Araragi encounters the horrifying vampire, Kiss-shot Acerola-orion Heart-under-blade A.K.A. the "King of Apparitions." He saves the fatally wounded Kiss-shot by offering his blood at the expense of his own life as a human. Now Koyomi has to face the vampire hunters to retrieve Kiss-shot’s limbs which were taken by these hunters...