The marionettist is the Demon Lord proxy.

Marionettists.

Perfection is for those who bear that title.

They have the authority to limit the powers and freedoms of the gods, with the duty of being the echo point of destruction.

However....how do they reach that rank?

There are two methods:

First:
Become the head of the Marionetist family.

Second:
Shortlisted to become the first head of the family, and continue the heritage.

The second method is the one that applies to her.

But.....

What if the Gems goddess, who was appointed to become one of the Marionettists, preferred to coexist with darkness and stretch out her hand to dissenters rather than those who were loyal to the commands of the sun?

For her destroying is far more simple than protecting.

With her presence, what is written in the book of destiny no longer applies.

Until she declares otherwise.

To think a divine being is his proxy.......is amusing after all.

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Kimetsu no Yaiba belongs to Koyoharu Gotōge.