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William is the lone human in a city of the dead. Born with vague memories of a past life in contemporary Japan where he failed to do anything useful, he is determined not to make the same mistake again, and that this time, his life will be lived. But
The protagonist, Yuuto Matsushima, is an ordinary young man working multiple jobs to save money for his future spouse. One day, by a twist of fate, he accidentally activates a mysterious "system." This system announces two things: first, that it has