Κένωσις, Kenosis: An act of emptying changed the entire world. In a corner of our world, a certain mental entity vanished.
He lost himself. Even his memories and perceptions were flattened into streams of information and sealed in darkness. When he finally awoke from that darkness, he had become a silver-haired, red-eyed girl, indifferent to the soul. From then on, he was forced to embark on a journey in search of love and redemption.
Note: 1. The protagonist won't be abused, this isn't a tragedy, and there's no single love interest. 2. Yuri and gender-bender elements, but the protagonist has no gender. 3. A vast setting, maps, and annotations. 4. A slow burn: the worldbuilding and plot unfold gradually, and there's a lot of content.