[It's not something she's read, so she can't really explain too much. But maybe that's for the best. She's probably said more than she should have, and maybe Susato can hear about the rest from Kazuma.]

I don't know much about the story, either. It doesn't exist where I'm from. But from what I understand, Hyde wasn't a very good person, and he managed to take control of Kazuma sometimes.

[It would seem, at least, that Susato is aware of some information regarding Hyde. But was clearly missing that one big detail.

She feels bad. Susato's reaction leads her to believe this isn't pleasant news, and Leia knows it's not, but... having to be the bearer of that news is tough. And it seems that she's potentially upset Susato without meaning to. She hangs her head, feeling guilty.]

I'm sorry, I thought you knew.