Kyuutei Mahou-shi Kubi ni Nattande, Inaka ni Kaette Mahou-ka no Sensei ni Narimasu - Ch. 1

[feha]

Jade, I didn't do it because if I were a homeroom teacher I would honestly lose my mind. Because this class is filled with troublesome failures

I dont get it. The translation feels really off. What didn't she do [because of not wanting to be a homeroom teacher]? And why does the class being troublesome result in "not wanting to be a homeroom teacher" not being the reason for her doing "it"?

 

[feha]

"Yeah I already introduced her"

No you didn't?