At one's limit with 限界

Kanji Explanation: Boundaries and limits with 限

Mina wants to hurry and eat her lunch, as she’s very hungry. Yukari reminders her they still have one more class first.

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

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.
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.
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.
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.