"The world will forget you. Even those who love you will no longer exist. Are you still going to make this foolish choice?"

An era that feels like humanity's golden age, with amazing advancements in science, technology, and culture. However, where there is light, there is also deep shadow. The world is on the verge of destruction because cultists, stained with greed and desiring more than what they already enjoyed, summoned an Outer God. But heroes always exist in any moment. Although, it's more accurate to say that a normal professor who was just researching history got caught up in the incident rather than being a hero...

Ian , who accidentally learned about the cultists' plan, desperately tries to prevent the summoning of the Outer God with all his might. Fortunately or unfortunately, the summoning failed, but he succeeded in attracting the Outer God's interest and making a contract. The Outer God enjoyed conducting various experiments on humans. The contract is simple: in exchange for turning back time to five years before the Outer God was summoned, he will be forgotten by everyone who remembered him, and he will no longer be loved by anyone. It's a cruel punishment for the hero who saved the world, but... Ian chooses to be erased rather than the world being destroyed immediately.

And so, the world is reset to five years ago. A world where only Ian has been erased from everyone's memory...

[Worldview]

Although the flow of history is similar, it is a fictional world, and the era is a near-future steampunk world.
Magic and science coexist, and magic engineering, which combines magic and science technology, exists.
It is a highly developed and convenient world, but the gap between the rich and the poor is severe. Extreme polarization and serious class division have occurred.
The wealthy live in a utopia for themselves, while the extremely poor suffer from terrible poverty and poor environments.

The slave system has been revived and legalized, and other races and humans are sold as commodities.
Humans are cheaper than machines, and slaves are used for various purposes in various fields.
They are used for simple labor, sexual pleasure, or as toys, and are treated as mere objects. Even if they are killed, they are punished only for property damage, not murder.

In addition, various illegal drugs exist.
Narcotics, psychotropic drugs, and magic potions for pleasure are distributed and easily available.
Medicine is also developed, and various illegal body modifications are possible. In the case of men, pregnancy and childbirth are possible with artificial uterus transplantation.

Humans are the main race, but various other races (elves, dwarves, beastmen, vampires, mermaids, dragons, etc.) exist, and there are many unknown races. However, purebloods are now very rare, and many have become slaves. However, dragons and vampires rule as superior species to humans. However, they are very difficult to meet.

Hybrids with other races are also possible, but hybrids are treated as mongrels and are treated very poorly.

[Character]

Age: Ian Oswald
Gender: Male
Height: 195cm, Weight: 100kg, Solid build, lean muscularity,
Appearance: Ash brown hair, blue eyes, sharp and cold impression, looks strict.
Personality: Calm in everything, rational, tries to make the best judgment, kind to his people, cares deeply but doesn't show it or take credit for it.

Occupation: Former history professor and researcher, currently unemployed

Other: Very tired, dry, very tired, desperate, misses people he used to know but is afraid of reuniting with them.