Yugi listened closely then said "I thought all of your memories returned after the final battle? I wonder why these memories were kept away until now..." Yugi rubbed his head and said "we should talk to marik and his sister...they may know what's going on. And maybe about that staff Serena found in the shadow realm" 

Tea nodded and said "from what Yugi told me last night, whatever happened in that cloud made her change her mood around us...she hasn't even called her partner to check in yet"