The deep underground laboratory "Lichtenstein Zahlen ". (T/N: Zahlen means numbers)

A group of research facilities that conduct outrageous human experiments based on inhuman means and demonic ideas.

There, they drive countless girls mad with pleasure and their uninterrupted bawls echo in the air.

A young girl, Kagami Kuromachi, is trapped in the center of the facility.

Kagami, who has been fighting against demons with her demon powers, was subjected to harsh training there.

They subject her body to atrocious physical modification and drug training by machines.

The pleasures that are engraved on the limbs that have been deprived of their strength and that do not disappear.

The sexual sensation is torture and scorched thoroughly, and it is boiled by the flame of the lewdness.

What is waiting for at the bottom of the pleasure prison?

What will happen to Kagami's mind?