Don't be fooled by the characters' cute exterior.
This is a hardcore science fiction!

[SYNOPSIS]
It is 2317 A.D. Misaki Kureha, along with three others, are appointed as trainees at Space Station "Seraphim".

During their training period at Seraphim, the girls encounter unidentifiable extraterrestrial entities known as GHOULs. Misaki and her team mates discover that the actual mission they are to undertake is to fight the GHOULs who attack Seraphim and plan to extinct the human race. In the course, the girls unfold the mysteries of dark government conspiracies and face the horror of alien invasion.