I Will Fight!.Despite Rossweisse trying to dissuade him from meeting Vali, Issei says he is willing to risk anything to save Rias. Finally giving in, Sirzechs decides to leave Rias' rescue to Issei and his friends. Issei and Koneko encounter Kuroka, who implores him to hand Koneko over to no avail. To reach the Dimensional Gap, Vali questions Issei on what he will do if he rejects him. In response, Issei summons out his Boosted Gear, saying that he will use force if needed. Pleased with his answer and determination, Vali gives the order to Arthur who reveals his family's prized treasure the Holy King Sword, Collbrande, and its ability to control and cut through dimensions. Before leaving, Azazel hands the Down Fall Dragon Spear to Asia, saying that it will protect her when needed. With the preparation complete, Arthur cuts through the dimension and brings the protagonists to the Dimensional Gap. Happy to see Rias again, Asia tries to approach her until Akeno notices Rias trying to attack Asia and rescues her in time. Left with no option, the team decides to suppress Rias first for her safety. In retaliation, Rias releases a powerful surge of Power of Destruction, deflecting all of their attacks at the same time. Issei begs Rias to stop as Koneko notices Rias responding to their voices. They immediately attempt to bring Rias back to her senses and reach her. However, Rias is corrupted by the cursed fragment of the Scale Mail, and she battles her friends. Akeno begs Issei to rescue Rias by fighting her as he is the only person capable of doing so. Initially refusing to do so Issei enters his Balance Breaker, and proceeds to battle Rias as their clash destroys the field created by Arthur forcing the others to return to the human world while Rias and Issei continue their battle.