第 7 集: 一誠面對龍之力量問題與誘惑之戰，同時西迪絲來到進行課堂觀察。

7

At the Occult Research Club, Issei informs the group that his client is Azazel much to Rias's dismay. The next day, the Occult Research Club is placed in charge of cleaning the pool, but Issei's Dragon arm acts up again requiring Akeno to suck out the Dragon power. Having cleaned the pool, the Occult Research Club fills it and starts swimming. Rias then attempts to seduce Issei by having him apply sunscreen on her back. Unfortunately, Akeno interrupts and tries to seduce Issei herself, resulting in a battle between the two girls. Fleeing the battle, Issei meets Xenovia who wants to have a child with him but Rias and the other girls intervene. Back at the Occult Research Club, Sirzechs and Grayfia arrive to greet Rias and her peerage. Sirzechs reveals that he has come for Rias' class observation day and to investigate the location for the meeting of the three factions. Sirzechs and Grayfia then head to the Hyoudou Residence to greet Issei's parents and Sirzechs spends the night in Issei's room. The next day, Rias leaves the Hyoudou Residence early to guide Sirzechs and Grayfia while Asia goes to Xenovia's apartment leaving Issei to go to school alone. On his way he encounters the stranger he previously encountered, who names himself Vali, the White Dragon Emperor. (Source: Wikipedia)