Zenitsu jumps for a second, almost wanting to immediately run away, a little too familiar with that look. But the moment the other opened his mouth to say something, he blinks at the sound he hears. This guy may look rough, but his sounds say otherwise, and that makes Zenitsu's scardy-cat nerves relax a little.

"Uhm..." Zenitsu starts, wondering how much of his dumbass mumbling was heard. "Do you happen to know Shinji-kun...?"

At times like this, Zenitsu wished he'd have the communication skills like his teacher, or even the friendly persona Tanjiro has.