Manga artists have grueling jobs, working around the clock while operating under strict deadlines, all with the pressure of pleasing an audience weighing down on the mind. By the time a series approaches its conclusion, these factors can heavily influence the quality of the ending of a story. Some series may whimper to the finish line, and a few might enter long hiatuses before they can even reach it. Others, however, deliver endings that are able to neatly wrap their stories in a bow, and immortalize themselves in manga history.

https://screenrant.com/incredible-manga-series-with-perfect-endings-list/