A well-known student not because of intelligence but to be quiet, and contrary to the people around him - Brook remained like nobody's around him as he was on his high school days. He spent himself reading, and playing instead of joining with ordinary students. One night, after he was soaked in front of his computer because of the game he's playing, he just lost his consciousness. Afterwards, when he opened his eyes, he then realized the appearance of the place where he is. Brook together with the four people beside him with their confused mind unexpectedly meet each other for the first time in a place which no one knows.