Yamada's group gets roped into making the group of first-year problem students lead by Takigawa Noa behave in order to open a yakisoba bread stand at the cultural festival. Noa is a witch, and appears to see the past of the person she kisses and latch onto their shortcomings. Worst yet, she seems to have volume two of the notebook containing the legend of the witches!
That's convenient for 
us in all sorts of ways!
Na, Glück für uns, würde ich sagen.
Me parece conveniente de muchas maneras.
Me parece práctico de muchas maneras.
Ça tombe très bien !
Beh, non potrebbe andare meglio per noi!
Isso é muito conveniente para nós!
Нам так даже выгоднее!