Dangerous sisters: Hunter without shadow

All around Japan there have been a string of VIP assassinations by some invisible criminal force.
At the same time, a group of sisters were entrusted to be the guards of a very beautiful VIP who is coming to Japan.

The VIP is taken off guard by an invisible force and the sisters are abducted along with her.
The horrible fate that awaits these three beautiful girls is a monster g*ngbang assault hell.
The monster's beautiful prey gets covered in one monster's cum after another.
Can these girls endure the never-ending punishment they are about to receive from the sexual monsters?
And just who are the 4 female warriors who suddenly appear when the sisters are in a desperate struggle for their lives?

The CG is at 800x600 and includes 22 pages without variations, including a side story.
22 more pages at a larger size also included.