Nine Peaks

The main character, Masio Gaku, doesn't get along well with his father. After a quarrel with his son, Masio Harumi dies. Gaku could not even imagine that so many people would come to say goodbye to his father, who is not a very sociable person.
Gaku soon decides to go fishing where he accidentally falls into the sea. but he immediately gets out with the help of some strange person. This stranger turned out to be his father, exactly in 2000! Now Gaku begins to help Harumi, his father, achieve the status of the leader of the city and figure out what is happening here.