There are many great anime series or movies, all for their own reasons but after "Mushishi by Yuki Urushibara" "Frieren" is special in its own way. From all the series that I have watched, it has the highest ratio of "I need to lean back and stare at the ceiling after an episode" moments. An episode starts and it ends but you often need a bit to absorb what you experienced between those two moments in time.