To Trust an Incubus is the story of Kenta, your average temp worker, who gets a job in a lab that's holding four muscly incubi in quarantine. They came through Professor Raiden's interdimensional portal like several other beings who visited before them.

The problem is that past interdimensional visitors have warned Professor Raiden about incubi that look just like these ones. They might be ravagers scouting Earth to plunder it.

The top linguist who works for the lab can barely communicate with the incubi. He's figured out the incubi need to bond with someone in order to learn their language.

Will Kenta be the one to 'bond' with one of the incubi? And if so will he be able to figure out if they're the evil ravagers or some other benign race?