Can anyone tell me what the series is about ? Can't find it anywhere.
It's about adventurers in a sort off post-apocalyptical world. However, instead of a true apocalypse, it was more of a slow decline, as the main source of energy in this world, Mana, started disappearing. This included the slow disappearance of Males, who were the main producers of Mana (females could be born without males via Mana, so the population didn't decline that much).
In the first game, the plot is all about the discovery of a strange sort of endless Mana, and the maquinations around it.
In the second game, the plot involves an extradimensional being and all the plots and counter-plots related to him, which end up involving both the main character of the first game, and a few entities of immense power.
In the third game, the plot is about an expedition to a country that had been destroyed by an invasion of monsters called "pests", and a curse that turned its inhabitants into more of them, except there is more to the story than meets the eye.