Overview:

The main character is a soldier who fights against demons – Kaito
One day, he meets a girl whose body has been taken over by a demon – Sophia.
The demon that took over Sophia’s body begins to attack humans using Sophia’s body.
Because of this, Sophia is imprisoned in a prison, and if things continue like this, Sophia may be disposed of…
But there was only one treatment that could help Sophia.

It was a treatment that involved having sex with the demon inside Sophia and hypnotizing it.
Although Kaito is skeptical, he decides to cooperate with Sophia’s treatment if he can help her…