There was a group of men who known as yarichin around the campus, they picks up a girl and have sex with them. But they died in an incident, a ridiculous one, their leader thoughtlessly light up a smoke in a room that filled with deodirizer gas. When they open their eyes, the first thing they saw was a pigman and a lizardman. They got reincarnated in fantasy world where demi-human is very common to see. Their leader who caused the incident was surprisingly calm, in fact, he always wanted to visit this kind of place and having sex with the woman in fantasy world someday. They’ve decided to live the same life as before, to become a yarichin, a guy who have sex every woman they wants.