Tenkai de no Shinikata How to Live in Land

One day, without warning, Saki became something invisible to all humans.

No one could see her.
No one could hear her.
She could no longer survive in the human world.

With nowhere else to go, Saki is taken to Land—a realm where the souls of the dead begin a new life.

In this world…

Death (Ascension) means finding true happiness.

Trees can speak.
People wield the powers of water, wind, fire, and earth.
And life follows rules unlike anything Saki has ever known.

As she struggles to adapt, she is helped by her assigned guide, Anse.

Before long, Saki discovers that she possesses a rare gift:

the ability to communicate with the sacred trees.

Because of this power, many believe she is the only one capable of finding the legendary fruit known as Millenio.

Soon, she is asked to become a Mee -one of the sacred Trees who guide and protect the souls of Land.

But accepting that role means confronting the past she has forgotten… and uncovering the true purpose of Land itself.

In a world where happiness leads to death, what path will Saki ultimately choose?

A heartfelt fantasy about the afterlife, where kindness and cruelty exist side by side.

This original story is in Japanese which l wrote. Translated by AI and confirmed the context by myself.