Many years have now past, and everyone has long since graduated from school and moved on in their lives. It only took a year from the incident at the bridge for the merfolk's President to make it known that they exist. All of the countries also agreed to allow the merfolk freedom, and gave them all rights of a human, no matter where they are. As for Nagasumi and Sun, the two married and now have two children, one boy and one girl. Every so often, Gōzaburō still tries to kill Nagasumi, but only when the children aren't around.
The end.