Deng Ainyang, who was born and raised in the metropolis of Shenzhen, followed her parents back to her ancestral hometown in the Teoswa area of China for regular sacrificial activities. In this countryside, Ainyang accidentally met a beautiful girl named Deng Kangsui. The two girls, who grew up in different environments, began to develop feelings after a chance meeting. Fleeting Summer's End is a short visual novel set in the remote countryside of Teoswa in the middle and late August.