With summer vacation just around the corner, Issei's got one thing on his mind spending sunny days with bikini-clad babes. Unfortunately, the Chaos Brigade is planning something big, and with heavy-hitters like the Norse God Loki in their corner, the House of Gremory is going to have to survive Rias' underworld boot camp if they hope to stand a chance. While they prepare, dark forces gather strength behind the scenes, Koneko's family reunion turns into a real catfight.