Ziel returned as soon as he finished his business. When he reappeared in the room where he was being treated, he saw Kalya and the girls sitting and chatting with beaming faces while laughing. Kyouka was also seen with them. Besides her, Queen Jasmine, Princess Seira, and Princess Irene also gathered.
Ziel couldn't help but smile when he saw the friendship between the girls. After realizing his presence, Kalya got up from her seat and jogged over to Ziel.
Kalya suddenly stopped and pouted when she smelled Azalia's scent on Ziel. Her relationship with Azalia was so close in the past few days that she remembered her scent. That's why she recognized it immediately after slightly smelling it.
Clara and the other girls' senses weren't as sharp as Kalya's. Because of that, they didn't recognize the scent on Ziel's body.
(Is it possible that something happened between Ziel and Azalia?)