At one's limit with 限界

Vocabulary Explanation: Outermost boundaries with 限界

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."