Hello World

On Christmas Eve, Tomoki Ikeno returns home from work and finds a silver-haired girl named Reina collapsed outside his house. She ends up staying with him. Though Reina lacks basic knowledge of the world, she demonstrates exceptional computer skills and appears to have a hidden past. A few days later, a woman claiming to be Reina’s older sister arrives and attempts to take her back. It is revealed that Reina is a top programmer for the military company Aegis and a key figure in the country’s defense technology. To evade Aegis agents pursuing her, Tomoki and Reina begin a journey to stay ahead of their pursuers.