Utena doesn't notice the distracted tone of voice - or if she does, she ignores it. Convinces herself it isn't her business. The silence makes her uncomfortable, and she's tempted to start another line of conversation, pointless as that might be, but Mami speaks up before she can.

She tenses slightly, as if afraid she might be chastised for being so familiar, so close. "Hm? What is it?"