Having moved schools frequently throughout his childhood, Fujino has perfected the art of the false smile. Now attending his fifth school, that well-mannered smile is safely helping him make new friends, but one day, on the school roof, he stumbles upon a scarred boy sleeping under the sun. That boy is the "Mad Dog", the student all his classmates are afraid of. While Fujino is observing him, the boy opens his eyes, and then...