Shijia has been used to relying on her sister Chizuko since she was a child, so she doesn't have to worry about everything. However, when Chizuko died in an accident, Shijia not only had to take care of her fragile and sensitive mother, but also had to play the role of her sister in various aspects. She often felt powerless, so she often complained to her sister's portrait, hoping to get her sister's help. One night, Shijia encountered the entanglement of a hooligan on his way to piano lessons. The ghost of Chizuko doubled his strength and subdued the hooligans. From then on, whenever Shiga encountered difficulties, Chizuko would appear to help her. At the age of 16, Shiga was admitted to the high school where Chizuko once attended, joined the school's theatrical troupe, and was chosen as the protagonist of the opera Chizuko once performed. In order to fight for the heroine, Jingzi, a classmate, called Shijia's mother anonymously to say that Shijia had a car accident and her mother fell ill again. When the father heard the news, he rushed home, and his lover chased him. After finding out, Shijia wanted to kill his father, but finally did not do so. Seeing the maturity of Shiga, Qianzu said goodbye to Shiga forever. In order to miss and repay her sister, Shiga picked up a pen and wrote down the title of the novel: "two people".