??????????

I dont know what exactly I've just seen.
People telling stories about their lives before making a crucial decision.
We see them sometimes playing children but with an adult body.
All is filmed like in a theatre stage that adds a feeling of falsehood.
There are seven huge holes in big rocks floating in Japan. Those who enter these holes never come back.
What's the point ? What does it mean ?
I'd like to know what other viewers think about this show. Did I miss something important ?