Kaguya

Kaguya is a mystery, lacking any knowledge of her past, or even knowing if she has one. What little she does remember is limited to short phrases, being her name, a string of numbers, and a fixation on the moon. Waking up in the Bunker without any understanding of the world outside makes Kaguya naturally curious about the others and their own experiences, as well as drawing her to read any books or papers she can find lying around. Why she’s here is a mystery, most of all to herself.

[From official site]