[Tip: This is not basic information about the world or the system, so unfortunately I cannot disclose it to you.]
Flain was already getting used to the system answering everything, but apparently not. He'll ask Flor, he should know the answer. Flain was quite interested because there might be a way to artificially increase mana density in the air, and that information could be very useful in the future.
Of course, there is also the possibility that the area around the academy has a higher density of mana than the Imperial City, but that would make no sense at all, given that the academy is located in this place instead of the Imperial City.
When he meets Itai, he'll tell him about Flor's shadow summoning ability so that Flor can't extract anything from Itai.
