It tells a story that happened before the confrontation between gods and demons.
"Don't you ever know how important you are!"
"I understand that for this world, this world..."
"You are important, not to this world, but to me, and to me alone."
The world only knows that gods and demons are at odds, but they have never thought about why the demon-sealing array can also be sealed by the demon god's sacrifice.
A sacrifice that had been chosen long ago and a well-protected goddess.
"Have I ever told you that I am a goddess who can save you?"
"I already knew it."
Concept: There is no absolute right or wrong