After someone was seen in an embarrassing moment, a friend apologizes, sympathizing with how mortifying being seen must be.
The words appear when the audience laughs.
コウノ君のこと好きってバレちゃった
It got out that I like Kouno.
Textbookコウノ君のことが好きだと、ばれてしまいました。'バレてしまった' becomes 'バレちゃった' ('てしま' fuses into 'ちゃ'), keeping the 'oops, it got out' regret. Casual 'って' replaces 'だと' (the 'が' is dropped too).
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Audience laughter in this scene0:22
laughstalkingthis line
デイドリーム「昼休みの特別教室」Daydream · Lunch Break in the Special Classroom
Two students at school are both feeling embarrassed about something.
The words appear when the audience laughs.
やばい、授業始まっちゃう
Uh-oh, class is about to start.
Textbook大変です。授業が始まってしまいます。"やばい" (close to "まずい/危ない") is blurted as "Uh-oh!" here: trouble, not "amazing". "始まっちゃう" is casual "始まってしまう".