Nishikata receives his first cell phone and can't wait to play tricks on Takagi-san.
He sends her a scary video to frighten her, but it doesn稚 quite work. 
As usual, Takagi-san has the upper hand when it comes to teasing...
Then it's decided.
.تقرّر الأمر إذًا
Dann ist es ja entschieden.
Pues decidido.
Pues decidido.
Beh, allora è deciso.
Então, eis aí.
Вот и решено.