Immediately after deciding not to rely on pretend dating anymore, Kazuya is hit with a triple whammy of reveals: Chizuru not only goes to his college but lives next door to him, and his grandmother is coming to visit and wants to see her.
You know he'll take it seriously. 
Stop messing with him.
سيأخذ الأمر بجديّة فوراً، لا تعبثي معه
Du weißt, dass er das für voll nimmt.
Spiel nicht mit ihm.
Sabes que se lo tomará en serio.
No juegues con él.
Sabes que se lo tomará en serio.
No juegues con él.
Il prend tout au sérieux,
alors ne le taquine pas.
Lui prende subito tutto sul serio,
quindi non prenderlo in giro, per favore!
Sabe que ele vai levar a sério,
então pare de provocá-lo.
Не надо его дразнить, 
он всё принимает всерьёз!