Seeing as there's not even a massive market for english comics you'd be hard pressed finding direct imports from Japan. Hell France is only over the water and it's next to impossible to find a decent selection of french stuff outside of the French Library. The odd second hand stuff shows up in some of the shops but any shop trying to sell direct imports legally would end up paying so much in import costs that they wouldn't be able to sell it for any reasonable price. A4 imports art supplies from Japan but the cost is so stupid that they can only bring a small amount in at a time to avoid massive import costs.
It's either order it online and pay the postage costs [there are a few cheaper options then amazon.jp if your good at figuring out non-english websites] or do a day trip to Paris and hit up Bookoff for cheap second Japanese comics or try any of the massive French comic book shops for french translations, they have a much bigger selection of Japanese stuff due to the massive comics scene in France plus you can grab some amazing French comics as well
. I treated myself to day over via Eurostar couple of weekends ago to see the massive Moebius expo and had to stop buying comics purely because I physically couldn't carry any more