Heya, I've not read it myself, but it sounded interesting so I did a quick google, and it sounds like this could be the series you're looking for:
Ocha Nigosu Manga | Anime-Planet
The descrip on MU says this:
"The story follows the high school delinquent Masaya Funebashi, better known as "Devil Ma-kun" who is trying to reform his image by joining the tea ceremony club."
May have to give this one a read myself at some point and do a synop for it. :)
