User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-33939194-20190105040411/@comment-2601:87:8300:20D0:3585:7CAD:D59:E63D-20190105045551

First  did you read the spoilers on rias and Grayfia's about their fight and what they were talking about. Well go from there. Honestly and I apologize before hand I thought it was self explanatory or obvious. In a sense and this could be argued but that fight is a bonus for what rias was fighting for. At the very least you do know why Grayfia joined right.