In the ruined city of the dead far from human civilization lives a single human child named Will. He is raised by three undead: Blood the heroic skeleton warrior, Mary the ladylike mummy priestess, and Gus the crotchety ghost wizard. The three of them teach the boy what they know and pour their love into him.

One day, the boy begins to wonder, "Who am I?" Will uncovers the mysteries of the undead hidden in this faraway land. He learns of the love and mercy of good gods, as well as the paranoia and madness of evil gods. And once he learns it all, the boy embarks on the path to becoming a Paladin.

[Source: Crunchyroll]

Two years had passed since he left the City of the Dead, and Will was seventeen by count.

As a lord, he developed "Torch Port, a river port of light", and gradually the people's activities and smiles returned to "Beast Woods".

However, out-of-season flowers bloom profusely, and an abnormality is discovered in the forest. Will and his friends head into the depths of the forest to solve this problem, and receive an ominous prophecy from the king of the forest.

"In the Iron Rust Mountains, the 'Fire of Black Calamity' will occur. The fire will spread, or it will burn everything in this land."

What is the calamity that sleeps in the ruined dwarven city of Tetsusabi Sanmyaku...!?

[Source: Crunchyroll]