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?