Ray Villan, a university student finds himself transported in a fantasy world. It excited him greatly, but what he didn't expect was the one who summoned him were strange cultists.

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 did that?