Atelier Lydie & Suelle: The Alchemists and the Mysterious Paintings

The story follows the alchemist twins - the reserved but caring Lydie Marlen, and the eccentric, carefree Suelle Marlen who work alongside their father at the family atelier. But due to his inexperience in alchemy they rarely see any customers. Source: Wikipedia, "Atelier Lydie & Suelle", available under the CC-BY-SA License.