At one's limit with 限界

ミナ:

「もう限界(げんかい)だよ！こんなんじゃ次(つぎ)の授業(じゅぎょう)、集中(しゅうちゅう)できないよー。」

“I'm already at my limit! As things are, come next class I won't be able to concentrate.”

Key Points

1. 限界(げんかい) = “at my limit”

   • In this scene, 限界(げんかい) means Mina has reached the point where she cannot comfortably keep going as she is

   • It is not an abstract “boundary” here, but her practical limit: she is so hungry that she feels she cannot make it through the next class properly

2. もう限界(げんかい)だよ = an emphatic complaint

   • もう adds the feeling of “already” / “I can’t take any more”

   • だよ makes the statement direct and emotionally pushed outward, like Mina is blurting out how bad the situation feels

3. こんなんじゃ is a casual contraction

   • こんなんじゃ is a spoken shortening of こんなのでは

   • Here it means “if things are like this” or “as things are now”, referring to her current hungry condition

4. できない = inability to do something

   • 集中(しゅうちゅう)できない is “be unable to concentrate”, with できない showing inability rather than simple refusal