Isana no umi (1997)

Original title: いさなのうみ

Renji grew up in a family that runs a pelagic fishing business and vaguely thinks about becoming a fisherman in the future. He is attracted to Kyoko, a new transfer student to his fisheries school who is knowledgeable about whales, but there is a big difference of opinion between Renji, who thinks whaling is wrong, and Kyoko, who advocates whale protection.