Ep. 12: Issei stürmt die Verlobungsfeier, um Rias durch ein Duell zu retten

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Issei wakes up to find himself passed out in his own bed after the Rating Game. Soon after, Grayfia informs Issei the results of the Rating Game. She gives Issei a magic circle that will allow him to attend the Gremory-Phoenix engagement party with Sir Zechs's message that if Issei wants to do something, then to go in and rescue Rias by force. Upon arriving, Issei crashes the party, but is interrupted when Sir Zechs comes in and offers to host a one-on-one battle between Riser and Issei to liven things up since he found the Rating Game unsatisfying. Riser and Issei engage in fierce duel that ends with him hitting Riser with holy water. Issei discovers what was on the back of the transport circle Grayfia gave him. Sir Zechs discusses his feelings and plans about Rias' forced engagement with Grayfia. Rias, overwhelmed by Issei's feelings and determination, acts on impulse. As a result of the duel between Dragon and Phoenix, some changes are going to occur at Issei's house while Asia and Akeno try to help him deal with the consequences of a choice he made.(Source: Wikipedia)