>>717552396
I made this recap of the story for another post.
This is not a super curated essay but what i got from the story after paying attention during the game, having watched the oficial lore video and reading some threads.
Spoilers of the endings obviously.

What i got is that Wuchang wants to resurrect her dead younger sister. To do so she goes to her childhouse home to retrieve a tool that her parents used to try to resurrect his toddler brother and fucked it up
She retrieves the tool (the chisel you start with), unbeknownst to her that chisel is a piece out of 5 of a more powerful tool. At some point during those events contracts the feathering disease which messes with her memory and starts taking her arm. She loses conscience at some point on the travel back and her companion leaves her in the care of a tao doctor studying the feathering disease.
Game starts
Wuchang helps find information on the feathering disease and its link to the "Bo" people while tracking the other chisels. She learns of the battle that the old deity had with its rival and how he trapped him but now is starting to seep out of his prison which is causing this whole red mercury shit.
Game ends
During the game we sort of learn that trying to ress her sister wuchang is trapped on a cycle of death and rebirth, this maybe related to straight out obsession, the fact that she has "Bo" blood on her, the chisel, or related to Tao mysticism. We learn about that from the boatman, which seems to be an agent or Death, or perhaps the Grim Reaper itself.
Eventually she is only to break the cycle in 2 of the endings by either going deep into an illusion world in which she ress her sister and lives happily ever after or learning to let go and moving on with her live, sort of taking Fan Yao as her younger sister surrogate. The other ending shows Wuchang trapped on the cycle and being experimented on by the tao doctor.

Without touching in the "themes" of the videogame thats what i got of the story.