While summary:
"My father also said that as long as you live, there is hope. But then if we come to die ... " Luna is optimistic despite her difficult student's life . Until she falls from the roof of her university. She wakes up then in a strange and hostile place where the only solution to get out of it seems to be to die repeatedly. Why is she here? and what does the entity named Y want, whose messages drive her to accept this cycle?