Help me find this drama!

Hey guys, yeeeeeeears ago I watched this Japanese drama about a school full of troubled students that gets sort of lifted out of the ground and transported to (I think) another world, and it follows the students and teachers dealing with what has happened, as well as the people left behind and how they react to the whole school disappearing and leaving this big old crater in the ground behind it. Anyone know what drama it was? It's been bugging me for ages now. Thank you!

long love letter? im not sure just check it.

Oh my god, I think that's it! thank you sooooo much >.< Ah, I'm so happy! Haha.