In Tokyo's Asakusa district, police officers Niiboshi Reo and Akutsu Mabu discovered a baby girl lying on a tray one day. Giving her the name Sara, they pledged to raise her together while performing their police duties in the area. As they carry out their responsibilities, they will encounter touching moments but also face obstacles as two male figures raising a child. Additionally, they will strive to unravel the origins of Sara's mysterious powers.