A Survival Guide for a World Overrun by Impostors

No romance. The protagonist is emotionally detached and puts self-interest first, with a way of thinking unlike that of ordinary people.

He wakes up in a psychiatric hospital. After checking his medical records, he learns that he suffers from intermittent amnesia. No wonder his mind is a blank. So he has amnesia. Well, that explains it.

Something strange happens at the hospital, and for no apparent reason, a government organization recruits him. The person who comes to invite him is the organization's top leader, making quite a show of it. He joins without hesitation.

Only after awakening his supernatural ability does he learn the truth about the world. It turns out that people who die under special circumstances forget that they are dead, then return as impostors with all their memories from life intact. And the only apparent price is losing the ability to feel emotions and some control over their bodies?

What a great deal!

But if you are reborn, are you still the same person you were before? Is this some wondrous spell that turns back time, or has the core inside your body simply been replaced?

New consciousness born with all the dead person's memories: you are not the original owner of this body. Don't forget that the unspeakable One is always watching you from the void. Find a way to evade Its gaze. Hide among the crowds as much as you can. This is the price of rebirth, the instinct of being an impostor.

Friend or foe, it all comes down to a single thought. There are two sides. Which will you choose?

Stop hesitating and make your decision, our beloved savior, our supreme god.