High School DxD Season 2 - Decisive Battle at Kuoh Academy!

Sona and her team form a barrier surrounding the school, while Rias and her team prepares for their battle against Kokabiel, Freed and Valper. The battle begins with Kokabiel summoning several Cerberus demons to battle the Gremory Team, which the Gremory Team successfully defeats with the help of Xenovia. During that time, Valper successfully combines the four Excalibur while triggering a self-destruct magic circle that will activate in 20 minutes while a mysterious young man looks on from afar. Rias and Akeno then attempt to battle Kokabiel but prove useless against his powers. Meanwhile, Kiba confronts Valper and learns the truth of the Holy Sword Project and with the help of his friends from the past and present, Kiba successfully attains his Balance Breaker and together with Xenovia who summoned her Durandal, successfully destroys the Fused Excalibur. With Freed and the Excalibur out of the equation, Kiba attempts to kill Valper, only for Kokabiel to deal the killing blow.