Two Pieces TP

A god, three Fates.

A soul, seven pieces.

Three Thousand worlds, waiting for one ending.

It to be taken, it to be made, it to rebirth.

To begin, and to end.

She hid herself in darkness, but her eyes danced with something unfamiliar :"Can you trust me?"

She walked on light, bathed in blood,wincing but determined: "Trust me."

Her, bones of dignity: "I give my back to you."

In yet another dark corner, a fire was going out: "Don't ever trust me..."

As she saw her driving the blade into her own heart. Despair.

The next time they met each other, neither understood the emotions that had driven them to make such decisions as they had.

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If you want to see it as mainly romance:
Raven x Russian white cat