Furansu Shiki Kottou Seikatsu

From Shoujo-Sense:
19th Century Paris, France. On the banks of the Seine River, managing a small antique shop, lives the gifted, self-made shopkeeper William. Along with his promising young apprentice Henri.
The story depicts these two’s many adventures together, and the incredible guests that they meet. A magnificent, quirky and romantic antique story!