The friendship of girls written on jeans is euphemistic and warm.

Maybe this is God's arrangement. The fate of Carmen, Tibby, Lenore and Bridget is doomed when they are all in the womb. Born in the late summer, she has a different personality but has been a sister since childhood. In the summer of sixteen years, the four sisters faced separation for the first time and spent a summer without each other. Unexpectedly, they found a pair of jeans, and the four sisters with different figures actually fit them well. As a result, the magical jeans became a token of friendship and accompanied them to start their respective journeys.