兄「お、落ち着け俺……、まず状況を整理しよう。なんでコイツが俺の部屋のベッドで寝てるんだ？……………。そうだ、あれだ、俺に貸してたゲームがどれくらい進んだか調べに来てそのまま寝ちまったとか、そうに違いない、うん。じゃ、次になんで俺の服が部屋中に散乱しているかだが……………。これは、そう、ハロウィンだ！お菓子くれなきゃいたずらしちゃうぞぉ～、なんてな！ハハハ…ハ…………。さ、最後になんでコイツが俺のシャツを着てるかだが……………」 妹「ん……、お兄ちゃん……」 兄「────ッッ！？お、落ち着け俺……、まず状況を整理しよう。なんで……」　＞最初に戻る────6話の翌日朝のイメージで。あの世界の妹は兄の留守中に部屋に忍び込むのが当たり前の生き物、これ豆知識な。

Bro: Okay, calm down... let's analyze the situation. Why is she sleeping in my bed? Yes, that's it, she came to check on how much progress I've made in that game she lent me but then fell asleep, yep. Next, as to why my clothes are scattered all over the place... This must be, yes, Halloween! Give me candy or I'll play a trick on you! Haha... yeah... And finally, why is she wearing one of my shirts...

Sis: Mmm... big bro...

Bro: ...!? Okay, calm down... let's analyze the situation. Why is... >Back to beginning.

I Imagined the events the morning after episode 6. In their world little sisters regularly sneak into their big brother's rooms while they're away, that's a fact.