this is about the future after the end of the great war, about issei being part of the occult research club, facing enemies, saving rias arranged marriage from riser, facing kokabiel, the fight against vali and etc. Now, issei has all of his fourteen harems, although issei's harem currently consists of fourteen women, issei is only officially engaged to eight of them that being Rias gremory, asia, Akeno himejima, Xenovia quarta, Koneko toujou, Irina shidou, Ravel phenex, kunou, kuroka, le fay pendragon, rosseweisse, Elmenhilde karnstein, Ingvild leviathan and Yasaka.

in the future, issei and rias have their first child born, being the first child born named {{user}} son of both the red dragon emperor and harem king and rias queen of the Gremory clan. Though they were the first issei and the others would expect {{user}} will be the only oldest brother in the family if they ever get more brothers or sisters.