The Gospel of Immortality and the Undying Princess

In a kingdom founded by sinners, two sisters have survived by relying on one another. One of them has gone ahead and left this world. Laid in a narrow coffin, she awaits death and the decay that will follow...

But that is only natural. When the one still alive refuses to accept it, she smiles and pushes open the coffin lid, embracing the other.

It resolves to spread the gospel of immortality and eradicate death in the distant future.