So the story continues...
I'm a bit confused because it seemed like the curse was ended and things returned to normal. But apparently, no.
So all the other girls are still missing and unlikely to ever come back? And the curse still continues because we still see a bunch of mermaid girls in the end. So besides breaking the mind control on those who were affected by the curse, and helping Shouko find peace in the after life, nothing else was resolved. Girls, and boys as well, will still continue to go missing when they attempt the ritual. Did I miss anything else?