Finally! I have read Tsunami written by Lafcadio Hearn.
After reading this story, I was impressed by Hamaguchi Gohei's wisdom. I think this story teaches us how clever old people are, and the terror of tsunami. We should notice how brave Gohei was, too. Even though we know what is going to happen(something bad, such as this story), sometimes we don't have the courage to tell everyone just because we are scared if nothing happened.