Yukari Morita embarked on a search for her father, who had disappeared in the South Seas, without fully comprehending the scope of her undertaking. The fact that she was a high school student attempting to navigate the journey alone was a noteworthy accomplishment in itself, but her path was altered when she encountered an astronaut associated with the Solomon Space Association. This organization was working to develop a rocket with immense thrust for the purpose of sending a human into space. The founder of the SSA, Nasuda, saw potential in Yukari's small stature and proposed an arrangement: if she agreed to take part in their astronaut program and launch into space using a rocket that had already been built with less power, they would aid her in locating her father. Could Yukari muster the courage and capability required for the most daring space mission ever?