Mujikaku Tensai Renkinjutsushi no Henkyou Machizukuri: Boujakubujin na Ane no Kawari ni Hatarakasarete Ita Imouto, Henkyou Ryouchi ni Sasensareta to Omottara Matte Ita no wa Ouji-sama Deshita!?
無自覚天才錬金術師の辺境街づくり～傍若無人な姉の代わりに働かされていた妹、辺境領地に左遷されたと思ったら待っていたのは王子様でした!?～
Lumina, a younger sister, has been working as an alchemist in the royal court in place of her older sister, who avoids responsibilities. With no support from her family or fiancé, she faces isolation. After her sister and fiancé end their engagement and announce her transfer to the frontier, she assumes they will suffer the consequences. Upon arriving, she discovers Prince Elms of the Ratman Kingdom is there to meet her.