Kumiko and the others prepare for Sunrise Festival. Kumiko and Shuichi talk about Taki-sensei on the way home from school, when they run into Reina.
Just so you know, I'm serious.
عليّ إخباركم بأنّي جادّ في كلامي
Sachez-le, 
je suis sérieux.
Sono serio, sappiatelo.
Só lembrando,