sentences:  In the collection of yōkai pictures, the "Konjaku Hyakki Shūi" by Toriyama Sekien, there is a picture titled "ameonna," and the explanatory text says "in Fuzan (Wu Shan), China, the goddesses become a cloud in morning and rain in the evening.The ameoona is probably like one of these" (もろこし巫山の神女は 朝には雲となり 夕には雨となるとかや 雨女もかかる類のものなりや).This quotes from an episode in the "Gaotangfu" (高唐賦) by the Chu literati Song Yu, wherein King Huai of Chu had a dream about falling in love with a woman in Wu Shan who, before leaving, left the words "I will be clouds in the morning, and rain in the evening, so at morning and evening, let's meet down at the balcony," and 朝雲暮雨 (Chaoyunmuyu in Chinese, Chōunbō in Japanese), written as "morning cloud evening rain," is an old chengyu (Chinese proverb) referring to secret relations between a man and woman.