蓝宝石般的被害妄想少女/Damsel with persecutory delusion

A strange letter came to the girl's hand, pointing to a vicious robbery and murder in Qinshan Port City more than a decade ago.

Li Meiyuan, a 17-year-old female high school student, lives in depression and delusion all the time. She almost excludes everything around her. Whether she is a classmate, a teacher or a stranger, the only person close to her is her mother and her childhood friend Yuqing. The arrival of a letter opened a wonderful journey of exploration.