An old note reading "Go find me" leads Chen Yan to the Sunken Ruins, a cavern complex buried deep underground. Time runs strangely inside the tomb, shadows can detach from their owners, and memory-eating miasma devours one's recollections. It holds the secrets of an ancient tribal civilization, and anyone who wants to escape must trade away their memories. Is the path ahead an escape, or a descent into becoming the next tomb guardian?