Succubus Connect! / Connection with a succubus!

The main character of the hentai is a girl named Yuina who is in love with her stepbrother and lives tormented by self-doubt. One day, a mysterious voice directs her to an unknown world. Not understanding what is happening, she is attacked by a strange man. In that desperate moment, she is saved by the ghost of a succubus, who takes possession of her body. The succubus defeats all enemies by fucking them, regardless of what happens to Yuina's body and mind.

Thus begin the adventures of Yuina, an insecure girl in an unknown world, "connected" with a perverted succubus.