Going in a potential viewer needs to be prepared for a heavy dose of Japanese cultural behaviors. On the positive side the subtitles were excellent maintaining a high quality translation throughout.

The basic story is a Japanese twist on the old TV series 'Lost' with two commuting train cars getting catapulted into the future leaving the occupants to learn to sort out their communities and how to manage to survive. The focus is on one of the cars' occupants (car#5) with the other car (#6) becoming those other people eventually getting discovered by our main characters.

My biggest problem was the writer focused on the relationships to the detriment of the story consistency. A few flaws here and there are acceptable but here even big story line points are trampled on which pulls the viewer away from the story itself and the characters' development.

Fewer background characters would have made for a better plot development. There are just too many people sitting around not contributing to the plot line growth.

Anyone who watched Lost may remember the character Hurley who weighed in at around 350 or 400 lbs for the entire six seasons! (Also the Captain on Gilligan's Island which was a comedy so maybe more forgivable.) The meager food resources the people were finding would have meant some weight loss even for the few months they were stuck in the future. And the hair and clothes would be deteriorating rapidly. It is very distracting to see clean faces and hair styles along with clothes that appear fresh from the laundry episode after episode.

There are other problems not adequately explained. These people are occupying a gone wild landscape with only a few distant buildings intact. Yet they find an intact power generating station nearby. That still works! All the buildings, roads, etc are gone with no trace, and there's still a fueled working power station???!!! The writer would have been better off contriving something with those glowing rocks and a periodically appearing wormhole than to go the route that he did.

Once the occupants of car #5, our main focus and characters, discover the wormhole they don't tell the nearby group from car #6. And then when they set things up to try and return they still say nothing to them apparently intending to just leave them behind, which they do. Not a word of guilt or conscience either before or after they leave them stuck in the future dystopian landscape!!???

It was worth the one time but not rewatching.