User blog comment:Mnzombie/Issei's Peerage/@comment-23853100-20131107025909/@comment-16281343-20140106161927

Well, Rias and Akeno graduating doesn't necessarily mean that the end is near. Issei and the others are still in High school. So, if we look at it that way, we still have 1 or 2 more school years in the series :D Long live DxD!