Ep. 2: Issei conhece os membros do clube e derrota um Anjo Caído com seu Braço de Dragão

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While at Kuoh Academy, the school prince Yuto Kiba leads Issei to the Occult Research Club where he meets the popular "mascot" girl Koneko Toujou and the club's vice-president Akeno Himejima. Rias briefs Issei on the current situation with angels, fallen angels, and devils; and the duties assigned to him. After going to his first assignment which involves an otaku, he encounters another fallen angel, but uses his Sacred Gear to transform his hand into an armored Dragon Arm and defeats her. Later, Rias warns him that since he has the Sacred Gear, he will be sought after by the fallen angels  (Source: Wikipedia)