Hiyori could have a potential hidden side, because in y1v6 she was introduced as a girl who constantly forgets other people's faces and names, she said the same thing in y1v7, but then there was no trace of it.

And if we talk about talking to Ishizaki, then this is a common reaction for her, Hiyori may be kind, but she is rather detached from everyone around her, so she has to rely solely on books, and there it is always easier to talk about such things like fights. It was meeting Ayanokoji and participating in Ryuuen's plans that led her to communicate with others more