The phenomenon of social aging is becoming increasingly serious, and a series of issues caused by this have attracted the attention of the media and social institutions. Elder Kijuro Takazawa was selected by the government as an experimenter for the "home care machine". This machine, code-named "Z", can complete all the work of caring for the elderly. As long as the elderly lie in the machine, they can spend their old age peacefully. However, the meticulous care of the machine makes the old man unbearable because of the lack of the most important human emotions, and behind all this there are hidden secrets of the military...
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