

He managed to cancel the Juggernaut Drive after poking Rias' breasts, with Bikou coining Rias the nickname "Switch Princess". Under Vali's advice on using a song to calm Dragons, the Gremory Group played the Oppai Dragon song that Azazel and Sirzechs created which helped Issei to calm down. Later, Issei entered his Juggernaut Drive after his negative feelings took over him during Asia's apparent death, going berserk. In Volume 6, Issei on his way to the Interview for the Young Devils Gathering, is told by the Underworld staff about his uprising popularity with the children of the Underworld due to his tendency of shouting Oppai and became known as the "Breast Dragon Emperor" and "Oppai Dragon" among them much to Ddraig's despair.

4.4 Oppai Dragon Dororon Youkai Clear Version.
