Open House Begins!.Vali approaches Issei but Kiba and Xenovia intervene; Vali warns them that since they were unable to defeat Kokabiel, they do not have the strength to beat him. Vali asks Issei where he thinks he ranks, in terms of strength, in the Underworld, and tells Issei that he is someone important. Vali then advises Rias to nurture Issei properly before leaving without a fight. Resting at the sickroom after meeting Vali, Issei questions Ddraig on his relationship with Albion; Ddraig explains how the two Heavenly Dragons came to be sealed into their respective Sacred Gears. At Kuoh Academy, Issei is once again put into a comical situation due to Xenovia's lack of common sense. He runs into Rias, Akeno, Sona, and Tsubaki discussing the earlier meeting with Vali, and their concern about their upcoming class observation. After finishing their classes, Issei, Rias, and Akeno hear some noise about a cosplayer in the gymnasium; heading there, they meet Serafall Leviathan, Sona's older sister and the current Devil King Leviathan, whose presence and antics embarrass Sona. At the Hyodo Residence, Sirzechs, Issei's and Rias's fathers enjoy a video of Rias' class observation, but Rias is embarrassed and leaves the room. Issei invites her to his room and the two share an intimate moment until Asia interrupts them followed by Sirzechs, who drops by to tell Rias that recent events and the expansion of her peerage have changed his mind about her ability to control her second Bishop thus giving her his permission to unseal him.