Sankarea Vol. 7 by Mitsuru Hattori
Ever since he was little, Otaku Chihiro has felt an unusual connection to zombie movies. It's not that he feels bad for the survivors - instead, he fantasises about comforting the poor undead girls they slaughter! When his beloved pet passes away in a tragic car accident, he decides to brew up a resurrection potion in secret. However, he's discovered by popular girl and local heiress Sanka Rea, whose life isn't as perfect as it seems and Chihiro suggests that she could serve as a test subject!