Probably the best film I've ever seen in my life

Yeah, if I had to pick a single favorite film this would be it.

Check out Sono's other work - he's an outstanding director.

What would you do, trapped in another dimension?

I'd say maybe "Swallowtail Butterfly"(May also be known as Yentown?). It's sort of a modern fairy tale. Can't say it's similar in its story or anything, but it's also quite long, yet you almost wish it was longer. The acting is great, it's pretty touching and the music is good too. It was immediately one of my all time favorites upon first viewing it:).