In spite of her outward delinquent personality, Kozue risks her life to save a nest of baby birds because she identifies with their loneliness and helplessness. Both she and Miki feel abandoned because their parents divorced when they were young, and their father is now remarrying. Akio, Touga and Kozue induce the insecure but moralistic Miki to rejoin the dueling game, becoming dirty in order to survive in a dirty world.