Ah man, I was stuck to this upon reading the title of the show which enveloped me like vacuum suction, I still repeatedly watch it as it has characters you can relate to from all walks of life and with understandable points of view. Each character has their spotlight throughout the series, some tragic, others for glory. I haven't left this series alone as I keep going back to it, because it's rare to have a multiverse of characters come together and see it play out. There were some slow spots, but they were fundamental to the plot and development to each character.
Spoiler though, you will get heart broken and possibly disgusted if you have a particular character that you happen to relate too or just like. This one is a mixture of sadness and happiness all at the same time.
Although it's unlikely, an OVA, spin-off/sequel season or a movie to just revisit them one more time would be appreciated, especially since the ending has a teasing preview that never happened. Not many shows leave one wanting more, but this is one of them.