In the year 20xx of a certain calendar year, people in society were further divided into different types of people.
Although some people have their own special responsibilities, more people are regarded as madmen and aliens. They peek at the people under the sun, some want to blend in, and some want to replace them.
Speaking in human terms: a story where the protagonist is looking for clues before and after he loses his memory.
Intention: cause and effect will be rewarded, everyone is equal