She says, "I am student council president Matsumoto Rise. Nice to meet you." Oh, and I'm science teacher Nishigaki Nana. I'm always looking for new explosion buddies....
What? You're lonely because the second years are away on their school trip? Don't worry, I'll stir up some ruckus for you....
No, I'll make some tea. It's not bad getting a change of pace from my experime---BOOOOM!
How many times do I have to say it?
¿Cuántas veces tienes que decirlo?
¿Cuántas veces voy a tener que decíroslo?
Quantas vezes você 
vai me fazer falar isso?