Long Love Letter (2002)

Similar in setting and themes, and accident causes people to go to the bleak future Where they learn to be human beings again.

The stories are very similar..A group of different people have to fight their own fears and demons in their search for freedom. Can they survive the test ?!

"To fight the monster you must become one."

The two dramas have absolutely nothing in common. And yet, if you're ready for one, you are for the other: they both require to think out of the box.

two surreal gakkou(-ish) dorama
that's in reality not much to have in common
but what the connection popped up in my head for is actually that I for some reason felt the *atmosphere* was same/similar (about Q10 e1-2); it's weird, 'cause technically the atmosphere is kind of exactly what is completely different

although I had the compulsion to make the recommendation due to such whim of a feeling, the fact that you'd probably really like them both or won't be able to like either is another thing - so...

Both are about young people who have to survive in the strange, mysterious circumstances.

High school students mysteriously isolated/separated from society.
Romance subplots amongst the overarching sci-fi themes.