FYI: this review is about S1&2
This was one of the first asian shows I watched and continues to be one of my favourites. It impacted me to watch other shows in the hopes they would capture the same eerie spirit. I knew nothing about it before watching so the anthology aspect definitely threw me off at first. The longer I kept watching the better the individual stories got and the more I wondered what the next episode could be about. Most of the stories were effective for me and were stressful to watch, because you always see the awful punishment coming. Sometimes the characters deserve it and sometimes they don't which gives the series another extra layer. We don't really know who Nanno is and why exactly she's doing these things but that didn't really bother me. If they would overexplain it wouldn't be effective anymore. We get to see different sides of her throughout and the amount we got was perfect. This was one of the few series I found intruiging from start to end. The Yuri character introduced in S2 was very annoying but made perfect sense in the story. I personally found some parts of S2 to be an improvement over S1 but overall they're on the same level. The ending actually made me shed a tear and I ended up rooting for my sister Nanno.