Sun Levain (サンルヴァン) is one of those bakeries that you'll likely stumble across during your stay in Japan. The bakery sells both sweet and savoury items. I visited the store on the second floor of the Skyo Building (Osaka), connected to Namba Parks and Namba Nankai station, but if you Google the store name you may be able to find a location closer to you. Eat-in/take-out available at most locations. Recommended for breakfast/snack.
