Naritsune and Yasuyori had a constant longing to return to Kyoto and came up with the idea of noting down nostalgic poems on a thousand stupa (long and narrow wooden tablets), and throwing them into the sea.
京を懐かしむ日々の中で成経と康頼は千本の卒塔婆に望郷の歌を記し海に流すこと思い立つ。