Kusaka reveals that the accident from 15 years ago was a scheme to sink the ship deliberately to get insurance. His father was murdered when he discovered the captain of the ship was drugged and left to die. Kusaka immediately set off bombs and escaped by sea and the Detective Boys gave chase.
Kusaka shares that the 15-year-old ship accident was a deliberate act of sabotage aimed at collecting insurance money. His father's life was cut short when he discovered the captain had been drugged and left to die. Kusaka promptly set off explosives and escaped by sea, while the Detective Boys pursued him.