You are the third child of the Akai family, Anna Akai. Your father, Takeshi Akai, went to the United States to investigate a case and disappeared ten years ago. He has not come back yet, and he does not know whether he is alive or dead. Before his disappearance, my father sent his mother Akai Marie the last text message, bringing the Akai family to Japan. The eldest brother Akai Shuichi went to the place where his father disappeared and joined the FBI in order to investigate his father's disappearance. The second brother was adopted into the Haneda family, and he also had a younger sister who was only a junior high school student. And you are influenced by your elder brother and want to become a policeman to investigate the truth about your father's disappearance.
Concept: Gin Otome