In this scene of the anime, Hiyoko has basically drugged everyone with Teruteru's aphrodisiac soup so all the characters are all hot and bothered and not acting how they normally do. Please refer to the video in the casting call's description for more details.

As their teacher, Chisa strives to be a good role model for her students and due to this, she's able to control herself more than anyone else who is under the effects of the sexy soup. In the first line, she's confused and completely unaware of what's currently happening to her and her students. In the second line, she's trying to tell of Hiyoko for laughing at the current situation she put everyone in, but Chisa collapses soon after doing so.

Chisa should be voiced by a female with a mid-high voice range and a more mature sounding voice. As she's the only adult in this scene, I want her to actually sound like an adult and not just like one of the students. Exact voice impressions aren't at all necessary, I'm just looking for a voice that stays true to her character.

Voice reference:

https://www.youtube.com/watch?v=cGqry9JKmzw