As Let extracted (interpreted?) the memories from her corpses, I was left wondering if she truly believed that her body and soul were separate entities.
Her attachment and reaction to the story of a love lost made me think this claim was always more of a coping mechanism, or a way to keep Rain from worrying. I thought, if Let didn't believe her body and soul to be wholly linked, at least they were made from some Miltonic materia prima: separate, maybe, but ultimately of the same stuff.
A lot to think about here. The visuals were striking. The conceit of moving up and down rungs of memory is ambitious, but you stuck the landing. Extremely well done. Thank you for sharing.