A war between heaven and hell is raging on Earth -- and hormonal fury is raging in Issei's pants. Enter curvy redhead Rias. She's president of The Occult Research Club, a club that doesn't actually research the occult. They are the occult -- and Rias is a Devil. If Issei can improve his mystical skills, he'll be able to help his hotter-than-hell master and her schoolgirl friends defeat their foes!