Sueharu has learned that Kuroha was lying about her amnesia. He asks her why she lied to him, but she refuses to tell him the truth. To Shirokusa, their fight just looks like flirting, and she realizes that the distance between Sueharu and Kuroha has returned to where it was before the confession festival. Unable to let the trend continue, she secretly sets a new plan in motion.
That was because you can't leave 
them at home on their own.
.ذلك لأنّك لا تستطيعين تركهنّ في البيت بمفردهنّ
Nur, weil sie sonst allein daheim wären.
Eso es porque no las puedes dejar solas.
Eso es porque no las puedes dejar solas.
Tu ne peux pas les laisser seules,
c’est ça ?
Nel loro caso, è perché 
non puoi lasciarle a casa da sole.
O problema é não poder
deixá-las sozinhas em casa, certo?
Ты не можешь оставить их дома одних.