Renkinjutsushi no Yurufuwa Ritou Kaitakuki

No one can deny that Freya is a prodigy. And this genius has high hopes for her life after graduation, hopefully working in a wonderful workshop in a bustling city. So naturally, she gets assigned to a backwater island far to the south instead! The local guardian deity is a mythical beast named Lilil who deplores the awful state the island is in. Lilil asks Freya to develop the island with the help of alchemy, and Freya just can't turn down fluffiness! Freia quickly gets to work and creates high-quality potions, a box that produces cool air, and more amazing magic tools. And that's just the start for this genius alchemist's plans!

(Source: Yen Press)