A flashback shows Lady Alfa and her daughter Ai overlooking their village, with the former expressing a desire of changing their village into a place equivalent to Heaven where the dead can be happy. As their travels continue, Ai learns that Hana had seemingly abandoned Hampnie ten years previously and in addition that Hampnie is searching for a way to end his life, since the thought of being the last living human terrifies him. Just as Ai deduces that he merely acts cruel to hide his pain, they are discovered and Hampnie kicks Ai off the bridge into the river below. Ai awakens to find herself on the bank with Julie who reveals Hampnie had saved her from an ambush but was hence kidnapped. Julie also notes that Hampnie does not like meaningless violence and has his own sense of morality, and he shows Ai a picture of Hampnie's lover, Hana, who Ai shockingly acknowledges as her mother. Julie then calls Hampnie an undying monster, and Ai yells at him, saying that she wants to find Hampnie and to stop him from becoming even more twisted. Julie decides to help Ai rescue Hampnie and then they are approached by Scar. Elsewhere, Hampnie reawakens to find himself held captive by a band of undead psychopaths. Their leader, a man called Hiko starts taunting Hampnie, who reveals that his true wish is to live a happy life and then contently die with few regrets while surrounded by those who care for him. Just then, Scar and Ai come to Hampnie's rescue much to his objection. Ai walks into the room and reveals a shocking revelation to Hampnie that she is in fact the daughter of Hana and also of realizing that everyone in her village had died long ago but they had pretended to be alive for her sake. Finally, with backup from Julie, Ai and Scar incapacitate the undead psychopaths. After accepting this revelation, Hampnie and Ai have a tearful father-daughter reunion, with the former revealing his true name: Kizuna Astin and as his wish is finally fulfilled, Kizuna dies the death he always wanted.
In the epilogue, Kizuna reawakens as an undead much to Ai's joy, and along with Julie and Scar, make their way back to Ai's village in the valley while spending as much time with each other as they can. Finally, at the village's graveyard, Ai buries her father Kizuna next to her mother, Hana, and mourns their passing. With the burial over, Ai states to Julie and Scar that if God abandoned their world, she will become a true gravekeeper and save it.