Kosuke and Natsume have been friends since childhood, but as time goes on the relationship between the two sixth graders seems strained as they keep avoiding one another. One day during their summer vacation, they go to a housing complex that is scheduled to be demolished. Having grown up there, the place holds a lot of memories, but while playing, they suddenly get caught up in a mysterious phenomenon and when they regain consciousness, they see an entire ocean before them as the housing complex has drifted into a mysterious sea and Kosuke and Natsume with it. Will they be able to return to their previous world? A summer farewell journey begins.