Ray Villan, a university finds himself in a fantasy world. It excited him, but what he didn't expect was he was summoned by cultists kneeling at him.

And around him were bodies upon bodies placed in chains and cages.

"Um, who are you people?"

"Please liberate us God Astin!"

A typical portal/isekai fantasy set in a medieval type world. University student, Ray Villan, travels to a world of swords and magic because of his horny ass. Yet this was not quite simple as he thought. Summoned by otherworldy cultists and called as Emperor of the Deep Astin, Ray tries to survive and possibly uncover the secrets of his summon.

But how can he seek his answer when his summoners suddenly killed themselves?