Powerful, disturbing and well worth a read.
This novelette packs an effective punch as it shows us a frightenly plausible future. The short length is perfect as it emphasises the sense of running out of time, and the tension is high throughout. Main character Ai is sympathetic if somewhat remote (understandably). It was almost painful witnessing her make decisions that we (the readers) knew would make everything worse. But those decisions made perfect sense in the context.
Overall, powerful, disturbing and well worth a read.