Sankarea OVA

Before zombies, resurrection potions, and complicated feelings enter their lives, Chihiro Furuya and Rea Sanka happen to cross paths during a strange visit to an outdoor hot spring. Neither realizes how important the other will soon become, making their brief encounter an oddly prophetic beginning.

Later, after the Furuya household has already become accustomed to the impossible, another mystery appears beneath the family temple: a young girl no one recognizes. Her presence drags Chihiro and the others into a new incident where even they cannot immediately tell what is alive, dead, imagined, or somewhere in between.