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The protagonist comes to a world where flesh and machinery are the main colors. There are only two countries in that world, one is the All Souls Empire, which is mainly based on the evolution of flesh and blood catastrophic genes, and the other is the Hearthfire Empire, which is mainly based on steel, machinery and rational data. That world clashed from time to time because of the different ideas of the two countries, but it did not cause a large-scale war, so it was still at peace. The protagonist was born in the toilet of a college in the All Souls Empire, and was abandoned by his young mother into a trash can. The trash can was thrown by the cleaners into the chaotic area between the two countries called the Valley of the Sunset, and then he was adopted by the scavengers of the mechanical tribe. A series of funny, fantasy and passionate stories happened after that.