Planet "Glassques" is in war with space life form "Rays" for many years. But Rays aim to conquer the Earth this time, so female warrior Feria from Glassques flies to help defend the Earth. On the scheduled day Rays don't show up focusing on Glassques instead. Feria can not return home, so she starts living a normal life, falls in love and even gives birth do a daughter. And then the signal of new threat arrives again after so many years. Mother and daughter need to fight or be tortured to death by Ray beasts.

[From vndbreview]