第1話: 一誠のドラゴンアームが覚醒し、キバがエクスカリバーとの過去を知る

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After a hectic morning, Issei's Dragon arm awakes forcing Issei to have Akeno remove the Dragon Power. While looking through photos, Kiba finds a Holy Sword among the photos of Issei and his friend while playing at that friend's house. Later, while on the way home after Issei completed a contract with his new client, Issei and his friends are ordered to hunt down a Stray Devil at an abandoned factory. The team manages to defeat the Stray Devil. Kiba is oblivious to Rias' questions about Kiba's actions. Kiba reveals to Issei that he plots revenge against the Holy Sword Excalibur. Later at his house, Issei finds out that Kiba was once part of a project called "The Holy Sword Project" being the only survivor of it. On his way back, Kiba witnesses a priest being killed by Freed being further enraged by the Excalibur Freed was wielding, leading to a battle between the two. Meanwhile, two strangers arrive in Issei's town, one of which holds a copy of the photo in Issei's album depicting Issei playing with her. (Source: Wikipedia)