New entries go to the bottom of the page. And obviously, expect unmarked spoilers for all previous High School D×D material.
Open Theories
Given how she seduces teenagers just like her real-life demonic counterpart, it would be no surprise if Issei starts a relationship with Roygun.
- Volume 2 shows her as one of the 12 Heavenly Breasts in Issei's dream. So it does have a good chance of happening.
Since we know that Issei will have children by the time of EX, Ishibumi will have to figure out a way to include these characters.
Asia's friend has been aware for awhile and has started learning magic. It would only be fair that Issei's buddies learn as well.
- bonus points if it turns out Motohama's ability to tell a girl's three sizes is from a Sacred Gear.
Confirmed Theories
Given how she was such a big fan of his and how she appears more frequently in the story than Sona's other Peereage members, she was likely to join Issei's Peerage. She transfers to Issei in Shin 4.
Jossed Theories
The first half of the Azazel Cup tournament. As the last novel of the original series started with the preliminaries, it would be appropriate to open the first novel of the series with a bang.
- Jossed. The only focus on the Azazel Cup is that the match ups are announced, which happens in Life.5. The first volume focuses on Ingvild Leviathan who becomes Issei's Queen.
