As Issei learns more about the conflict that has raged between Devils and Angels, he discovers that his 'girlfriend' was actually a Fallen Angel named Raynare, sent to destroy him because he possesses a 'Sacred Gear,' a divine weapon given to humans by the Gods. Luckily for Issei, he's saved when he summons the beautiful Rias Gremory, a high-ranking Devil, who reincarnates him as a Devil servant.

'Would you mind dying right now?' are not the words that high school student and lifelong pervert Issei Hyoudou expects to hear from his first girlfriend, especially not before being brutally murdered on their first date.