User blog comment:FrankieX98/The future members of the Issei's harem and peerage./@comment-2208155-20180910082121/@comment-2601:87:8300:20D0:F813:353D:51A2:CE35-20180914132315

I'll repeat this as many times as you want Ex is about Issei's future children. I thought that was obvious why they are part of the story. Your thinking way too much and not necessarily. You can't possibly tell me that you or anyone else would have not wondered why they weren't there if that happens. There maybe more children from different mothers but the main children were there as the climax of the story, fighters, supporters and what to look forward too. For all we know Shin could lead Ex.