Koyuki is a normal high school kid with a big problem: he can't stop himself from screaming at his crazy friends. He swears to himself each day that he'll stop, and each day he fails.
Stop playing with the variables! 
This is math!
!كفّ عن العبث بالمتغيّرات! هذه رياضيّات
Hör auf mit den Variablen zu spielen!
Das ist Mathe!
¡No juegues! ¡Son matemáticas!
¡No juegues! ¡Son matemáticas!
Smettetela di giocare con le variabili!
È un problema di matematica!
Parem de brincar com as
variáveis. Isso é matemática!
Хватит играться, мы тут учимся!