The Cat of Baiyun Mountain

Yuqing, an ordinary high school student in Tongshi Town, suffered from a serious illness ten years ago. However, to Yuqing's surprise, he gained the ability to control time after his rebirth after the serious illness. When he first entered high school, he was obsessed with a white cat. The white cat said that Yuqing's abilities were given by it, and decided to play a story with Yuqing about the lives of 15 problematic girls in the class. What is the intention of the white cat? Is it to save those troubled girls or something else?