The untranslated kanji is composed of 金 and 竟, the only kanji with such component is 鏡 (mirror), there is no word with both 金 and 竟 as separate kanji, so the untranslated text is probably 先生の鏡 (Sensei mirror), but it don't make sense with the rest of conversation

Akatori2st said:

The untranslated kanji is composed of 金 and 竟, the only kanji with such component is 鏡 (mirror), there is no word with both 金 and 竟 as separate kanji, so the untranslated text is probably 先生の鏡 (Sensei mirror), but it don't make sense with the rest of conversation

Maybe it’s describing how Kei’s seduction attempt had no effect on him? Like enemy magic bouncing off a Reflect spell in a Final Fantasy game?

Blank_User said:

Maybe it’s describing how Kei’s seduction attempt had no effect on him? Like enemy magic bouncing off a Reflect spell in a Final Fantasy game?

Maybe? idk.

Anyone can complete the translation if they know what it means.