Hayato went to Nagoya to learn karate from Ryuji, but Ryuji only sent his younger brother Tatsumi to guide him on the first day. Ryuji tells Hayato the story of his father's accidental death, and teaches him that karate is a conversation that speaks louder than silent. Hayato decides to go to the underground world to attend the meeting, and Long Si drives the Doctor Huang with him.