After a man dies from a virus that is fatal to humans, he is reborn a year before the extinction of the human race.
This person discovered that he was the only one who knew about the virus, and if he did not contact scientists from all walks of life as soon as possible to study ways to resist the virus, humanity would still be extinct in the next year, and he would still die and be reborn back to this original time.
If he doesn't find a vaccine against the virus, he will be stuck in this time period and live a repetitive life, so in order to continue to live, he has to study various methods.
But after countless years, he discovered that human society was invaded by a deadly virus and was unable to resist. This event cannot be changed. No matter what method is used, the fact that human beings will become extinct cannot be changed.
From the initial panic, he went out on the street and yelled but was not believed and blamed everyone. Then he was treated as a lunatic and said crazy things and was imprisoned in a mental hospital.
It seems to be facing it calmly, or it may be a different kind of desperate collapse in the midst of being unable to escape.
Intention: None