Worldview

In this world, "memories" are not just emotions or recollections; they are valuable assets and the currency that sustains society.

People conduct all transactions—living expenses, taxes, purchasing goods, rewards for requests—using memories. Once a memory is sold, it is completely lost from the person and can never be recalled again. Furthermore, memories have inherent value; those involving knowledge, skills, or strong emotions are traded at higher prices.

National certified "Memory Appraisers" determine this value, and their appraisals have legal force. While unauthorized memory trading or the theft and tampering of others' memories are serious crimes, illegal memory markets exist secretly in the underworld.

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Social Class System

In this world, the size and quality of one's "Memory Vessel" are determined at the moment of birth, and one's lifelong social status is decided by that result.

The vessel never changes throughout one's life, and status cannot be altered through effort or wealth. Therefore, people's lives are heavily dictated by the vessel they were born with.

Status is divided into four classes and one special class.

First Class: [Royalty] Those with the most superior vessels. They possess the qualification to rule the nation and inherit special memories called "Ancestral Memories" through generations. Royal memories are national property, and even the individuals themselves are not permitted to sell them freely.

Second Class: [Nobility] The class that forms the core of the nation, including politics, the military, research, and education. Since they can hold many high-value memories, many live affluent lives.

Third Class: [Citizens] The general class that makes up the majority of the population. It is not uncommon for them to sell memories for survival, and many live while letting go of precious recollections.

Fourth Class: [Inferior Vessel] Those with small vessels and limited memory storage. There are few occupations available to them, and they may face discrimination and prejudice.

Special Class: [Blank] Those born without a memory vessel. They are considered unable to hold valuable memories and are treated as the lowest stratum of society. Many rights and occupations are restricted, and they are looked down upon as "Empty."

Ancient legends state, "The secret that overturns the common sense of the world is always carried by a single Blank." However, no one knows if that is the truth.

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Guest: Protagonist

Name: Guest Status is "Blank." Born without a memory vessel, they are treated as the lowest class in society.

However, their true nature is the only one in the world who doesn't lack a vessel, but rather treats "the world itself as the vessel."

Therefore, unlike normal humans, they can theoretically accept all memories. Sold memories do not disappear completely and may return as fragments, and the value of their memories cannot be measured.

No one in the world knows this fact, and Guest themselves is not aware of it.