Kouchou-sensei to Kujira

An old man who is the headmaster of a primary school bordering the ocean paints a picture of a whale, an animal he had seen so often off the coast when he was a boy and now sees all too seldom. He reminisces about his youth, when he simply considered whales a food, though he vividly remembers a time when a whale was speared by a whaling ship. He knew of no other way to treat whales then. But that day he sees the first whale he has done in a long time - and it is beached against the rocks. He races out of the school to come to the whale's aid.. -Planet