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...
Why didn't I think of something
 that simple earlier?!
!لماذا لم أفكّر بشيء بهذه البساطة سابقًا؟
Wieso ist mir das nicht
schon früher eingefallen?
¡¿Cómo no noté algo tan simple?!
¡¿Cómo no me di cuenta
de algo tan simple?!
C’est évident ! Pourquoi
je n’y ai pas pensé plus tôt ?
Com'è che non ho pensato prima
a una cosa così semplice?
Por que não percebi algo tão simples?
И чего я только сразу не подумал?!