I think this series is all about personal pains, regrets, inner sufferings and the healing process by appreciating life and counting all the little blessings we can find. There's a positive message there and it's quite suitable for its main demographic - tired average workers who might be going through a quarter-life existential crisis that happened to read a lot of feel-good stories tend to be found from Isekai mangas. Not the kind of manga most people want, but the kind that most people need/deserve.