I think rias does remember, but he thinks that calioppe doesn't remember... On the other hand, calioppe doesn't know that rias remembers, so she thinks that she is the only one that remembers the past.. Well at some point, she does have her suspicions that rias might remember, but she couldn't be sure
ahh tysmm!! :D
I think rias know that calioppe remembers, there's a chapter that he mentioned calioppe protecting her family.
Ahh he did? Oh boi I forgot about that haha~ I wonder why he pretends not to know tho *sigh
did rias (the dude with blue eyes and white hair) returned to the past?? and already knew what happened to her and her family in her past life?? cuz its kinda confusing T-T and if he did return, does she know that he also returned??