Sankarea: Undying Love (2012)

Furuya, a high school student captivated by the undead, concocts a potion to resurrect his beloved cat. His life takes a turn when he encounters Rea, a girl trapped under her father's oppressive thumb. In a moment of despair, she consumes Furuya’s experimental brew, leading to her accidental transformation into a zombie after a fall. Embracing her new undead existence, Rea finds refuge with Furuya, who has always yearned for a zombie girlfriend. However, their unconventional romance faces obstacles, including Rea’s deteriorating condition and her father’s relentless pursuit to reclaim her. Together, they navigate love and life beyond the grave.