Issei is back with Rias and Asia living in his house, and Kiba starts acting weird when he sees a picture of a holy sword at Issei's house.

Issei and Kiba fight the Xenovia and Irina, and Issei tries to deal with the consequences of their fight.

Issei and the others team up with the church to fight Freed, but an even greater enemy appears.

The Kuoh Academy students fight Kokabiel and his minions to defend their school and their town.

The Occult Research Club fights Kokabiel and learns some shocking truths about the power struggle between the angels, fallen angels, and devils.

The Occult Research Club takes over cleaning the pool to thank the student council for their help with Kokabiel, and Issei runs into a lot of trouble.

Issei learns more about the feud between the Twin Sky Dragons and Rias and Sona have to deal with troublesome family members at Open House.

The other Bishop of the House of Gremory is released, and Akeno takes Issei to meet a new acquaintance.

Issei meets Michael, the Chief of the Angels, and continues training Gasper in the days leading up to the Leaders' Summit.

Time stops during the Leaders' Summit, and Issei and the others meet a new enemy.

Issei battles Vali and discovers hidden depths to his power as the Twin Sky Dragons face off.