A game entirely dependent on dialogue should never have such horrendous writing... but that was awful. The dialogue is so unpolished that it seems to constantly recon itself, such as by saying the mana from lust was "100 times" more than previous yields, then saying in a later dialogue that lust gives "10 times" more mana than usual. Also, if mana is such a valuable resource and is in place of what would typically be fruit, water, and other life, why not use the mana from lust to make all that, then arm the kingdom with the rest of the mana which as described by Gobo is enough to make anyone in possession of such an amount the ruler of all the lands. The protagonist is foolish because at the potion stand he was told how dangerous monsters can be and was told they could kill, then immediately sprayed the girls with monster pheromones, attracting a group of monsters to them. Also, how has no one discovered lust as a resource to create mana? And what is the point of this being a game instead of a comic if there is no player action? 

Ultimately, the worldbuilding for Lust Empire is so poorly thought out that the whole narrative shatters within minutes of starting the game. The terrible dialogue does not help either.