The Japanese girl Sumiregawa Nanako is only thirteen years old but she is a genius writer. On this day, she went to Hong Kong to hold a signing event, and the signing event was full of joy. However, what caught everyone present off guard was that a terrorist attack suddenly occurred at the scene. The scene suddenly became chaotic, and people fled in panic. When Nanako panicked, the guides Michelle and Maggie risked their lives to protect her, and Nanako managed to save her life. However, the matter is far from over. With the discovery of the situation, Nanako was shocked to find that it was not accidental that she encountered the terrorist incident, and that the terrorist incident was actually aimed at Nanako. At this moment, Nanako received another threatening letter. In the letter, someone threatened to attack Nanako's signing event, and Nanako must die here. Nanako really couldn't figure out who would target her. At this moment, Nanako is surrounded by only Michelle, Maggie and their sister Ani who can protect her. Several people decided to investigate who wanted to kill Nanako and what their purpose was