The Whole World Has Lost Their Memory, Only I Remember

I remember dying. But in this world, no one remembers "death". They don't know where they come from, what happened in the past, or even why they are alive. Until someone "thinks of it." Then he disappeared. No body, no trace, like it never existed. One rule I quickly learned: Here, memory is not power, but death. But the problem is—— I, from the beginning, remember everything.