Tennoji Masami is informed by the Cosmic Investigation Bureau about the existence of aliens called the Sheevers on Earth. Since she is not affiliated with the Galactic Federation, her actions on Earth are restricted, so she takes it upon herself to track down the Sheevers instead. However, a special liquid released by the Sheevers causes the ferocious native creatures known as Burguses to go on a rampage. Even with her powerful physique and combat skills, Tennoji is overwhelmed by the Burguses. Ultimately captured by the Sheevers, she is interrogated about Earth's invasion plans, but she refuses to reveal their true objective. The outcome leads to a tragic BAD END.