If becoming a "tool" is already an irresistible cruel fate, then what is even more cruel than this may be that the real world is destined to be crippled if it still maintains its disposition as a "human" in the process, but there are always people who do not want to be assimilated into the crippled part, and they have to use reason, emotion, art, and all purposeful labor to fight against it...... In the year 4631 of the world calendar, a middle-aged man who had been imprisoned in a foreign country for seven years returned to his homeland, and the story officially began here.