A young man named Norikazu finds a computer from World War II buried in his back garden. When he activates it, he and a girl named Midori are transported to Hell where erotic creatures and monsters of different kinds live. They meet some friends including a sexy elf type woman named Eganko who falls in love with Norikazu, and a perverted monster prince who is soon enslaved by Midori. Using their new friends the pair try to make the dangerous journey back home.