Son of Kokabiel

Hyoudou Issei, the Unholy offspring of the Fallen Angel Cadre Kokabiel is on a quest for vengeance. Will he realize how close his enemy really is, or will he ignore the signs until it's too late? Murayama Kaori and Katase Yui are the most recent members of Rias Gremory's Peerage, but what really is Kaori's Sacred Gear? (Fallen Angel Issei)