There isn't much material to give a proper rating, but for now the book is a 5/5 for me.
I've read all the released chapters (12) and so far it's pretty good. Things are well described and there is a considerable amount of secrecy, both around the MC and the surrounding situation. But it's still easy to see that an apocalypse has started in the MC world, and more will likely be explained about it in the future.
About the MC, it can be said that his behavior is very realistic. At first I was a little annoyed that he always complained, but then think that I was irrational: The MC is in the apocalypse; dies; mysteriously revives; he needs to find someone he doesn't know; he has to survive situations that realistically have very high probabilities of certain death. So yes, his initial despair makes sense.
The way the Author approached the actions and consequences of the MC is also very well done. So far, there have been no forced situations, like making things too easy, or making a situation too difficult/complicated just to put on a false sense of danger.
The characters that have appeared so far seem alive and seem to have the ability to think for themselves. This may seem strange, but anyone who's been here on this site long enough is aware of the existence of novels in which all the characters, except the MC, apparently don't think and are totally one-dimensional. These characters' lives revolve around the MC and making their own decisions is a distant dream for them. Villains are also usually horrible, so seeing characters who make their own decisions and who aren't the MC is a relief.
[Google translator]