The father was going for a walk, and the mother decided to take the opportunity to harass him. This man decided to record everything because he was afraid of any false accusations by the mother.
This is what happened when the father tried to address the mother for abducting their son from the United States to Japan, without his permission or knowledge.
Child abduction is not a crime in Japan. Instead, Japan grants sole custody to the abducting parent because Japanese law does not recognize international laws on shared custody or the right of the child to have both parents, no matter the circumstances once the child is on Japanese soil, you can file for sole custody from another country.