Ep. 5: Kuou Academy Battle: Rias Team Fights Kokabiel and Valper

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Sona and her team form a barrier surrounding the school while Rias and her team prepare 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 Excaliburs while triggering a self-destruct magic circle that will activate in 20 minutes as a stranger looks on from afar. Rias and Akeno then attempt to battle Kokabiel but prove useless against his powers. Meanwhile, Kiba confronts Valper and realizes the truth of the Holy Sword Project. With the help of his friends, Kiba successfully attains his Balance Breaker, and together with Xenovia who summons her Durandal they successfully destroy the Fused Excalibur. After Freed and the Excalibur are defeated, Kiba attempts to kill Valper. Kokabiel mortally wounds him and tells the Occult Research Club that Issei can transfer his power to anyone as Issei prepares to transfer his powers to Rias. (Source: Wikipedia)