La Libellule Mécanique

La Libellule Mécanique is a steam-punk otome game. Céleste, the protagonist, is searching for her father, the inventor of the Libellule Mécanique. He was taken in the city of Koréare, an underground city populated by people banished from the upper city, by an organisation that wants to use the Libellule Mécanique to conquer the upper world.