I choose to believe that the MC lives out the remainder of his life with the knowledge of all the deaths that are going to happen before him and saves every single one of them (that can be saved, anyway). Even the criminals. What a touching story.
Honestly you can't expect too much out of the ending when the series has a very weak overall plot in the first place. Reading this was a good experience and a unique feeling compared to other series in the same genre and I'm thankful for the scans.