The protagonists of this book are Shang Dongxue and Di Xiafeng. They have been good friends from birth to life and death. They have loved practicing martial arts since childhood and are two girls with a strong sense of justice. During the summer vacation, they met Bai Sally who worked in a cafe and became good friends from then on. Friends, she has been obsessed with detectives since she was 4 years old, and often helped Shang Dongxue and Di Xiafeng solve cases. Later, they met Shen Lang, the leader of the "Axe Gang" during this adventure. Shen Lang entered the right path again and became enthusiastic and kind. When they solved the case of the Axe Gang, they By chance, he met Yue Lingkong, the leader of the "Golden Beetle". He was originally Shen Lang's rival, but because he entered the righteous path again, he was no longer pursued. Yue Lingkong was mysterious but kind-hearted, and often helped Shang Dongxue and the others. Lingfeng was Shang Dongxue's deskmate, known as Smile. What connection does the prince have with this world? There are also four chivalrous knights who are just like Monk Dongxue and others in the book. It is because of these brave female knights and heroes that Kuzu City has become quite righteous, because - chivalry will never be extinct!