[Omnikaiser]

I have no doubt the show won't stay as light hearted as we can see now.

Even just for the fact Alchemy is sometimes seen as a discipline/art where humans play God, trying to create life, purify souls, doing human sacrifices and all. It can turn dark pretty fast.

At first I was worried about the action being inside the school too much, like Fourze was (even though that was a cool show), but it seems like the protagonist is moving to that specific Alchemy School, and we could have some kind of "Harry Potter" situation here, the normal guy suddenly being placed in a magical/mystical place and you never know what could happen in such a setting.
Things could go pretty dark with a teacher willing to sacrifice students for research etc etc...