Autumn wind shojo refers to the lonely autumn wind that blows after the busy summer season has passed. This is an analogy for losing momentum and increasing loneliness.
 

``Shojo'' is a feeling of sadness when a plant withers. By combining it with ``autumn wind'' to create a four-character idiom, you can imagine the transition from summer to autumn. By the way, it is said that the reason why people miss people in autumn is related to the decrease in daylight hours and the decrease in the secretion of hormones (serotonin).

Autumn wind shojo = shufu shojo

The four-character idiom ``Autumn Wind Shojo'' is pronounced as shufu shojo.
 

Learn Japanese words “four-character idioms”
Four-character idioms, which have been popular in Japan since ancient times, are words made up of four kanji, as the name suggests. Although it is said to have originated from Chinese, the four-character idiom, which is short but has a condensed meaning, is still used in various situations today as a means of concise expression. Here are some four-letter idioms that you may have heard but don't know what they mean, or you've seen them but don't know how to read them.