After graduating from college, our hero in unable to obtain full-time employment and ends up working part-time. Sora receives an invitation from his high school alumni association. He was born and raised in a small village in the mountains, where the he population is now rapidly dwindling. His school has already closed down and the village itself has merged with the next village. According to the letter, the village will be stripped and completely rebuilt. The school will be demolished as well. The letter also says that a class reunion will be held at the school before it's torn down. The invitation hasn't been signed and there is no forwarding address. He has no idea who sent it, and the vagueness of the letter makes him a little wary. However, he decides to attend the reunion to see his old friends and visit his old village.