[Premise / Concept]Girls fighting against the extraterrestrial being called "Alter" are defeated,
then r*ped as seedbeds and screwed up just like their toys.

[World Setting / Synopsis]In the year 20XX...

The human race has been under the threat of suddenly appeared
extraterrestrial beings called Alter, gradually driven into extinction.
Alter's scientific technology enormously outstrips humanity's.
There remain almost only women after men died in combats.

But people still see a light of hope.

Alter's weapons start emitting light as soon as girls grab them.
-- A chance of survival may come if fighting with this combination...
Surviving ones try to fight back Alter again with new weapons.

The girls of the last hope are named: Valkyries.

[System Overview][1] Confinement / Rescue System
If either heroine was defeated in battles (except boss), the defeated one
will be taken. Once captured heroines will continuously violated until you rescue.

[2] Numerically Observable Confinement Situations
So as explained captured heroines are continuously r*ped. You can tell
what is happening there through displayed values (e.g. count of ejaculation, orgasm)

[3] Get weakened by being r*ped and tormented
Heroines are weak at the first place. They are strong only when with
Alter's weapons. Which means captured heroines' equipment can easily
be weakened by Alter that is the original owner of the weapons.
It is recommended to rescue heroines as soon as possible.

[4] Open World
The ultimate purpose of this game to seize all of the hostile strongholds.
You can begin attacking with any strongholds of your choice (only 1 stage in the trial).
When you seize a stronghold the enemy becomes stronger.

[5] All scenes will be unlocked after game clear (only in the retail version)
As a post-game content, you can see all scenes including ones you failed to pick.

* Notice
Requires RPG TKool VX Ace RTP: http://dlsite.jp/RPGTKool_eng/