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!?

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!? cover

Lumina, the younger sister, has been working diligently as an alchemist at the royal court in place of her older sister, who spends all her time playing around. She can't rely on her older sister, parents, or even her fiancé. As she endures her loneliness, her older sister and fiancé suddenly break…

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