User blog comment:FrankieX98/The future members of the Issei's harem and peerage./@comment-86.149.63.148-20180910063812/@comment-2208155-20180910083355

I remember one topic about the chronological order of events:

https://highschooldxd.wikia.com/wiki/User_blog:Bennia_Lover/Chronological_Order_of_Events

I can´t help you with nothing more.