The bow does seem to settle him a little; it's clear that no one here recognises who he is, but he is fine with that. Formality can sometimes be a little much, even for him.

"It is good to meet you, Ishigami Senku." From a man well versed in using first and last names. Head tilting, he looks over at the tea before he settles himself down.

"Have you been here long?"