Mizuto and Yume used to date, but now they've suddenly become stepsiblings. Both of them agree that they don't want to do anything that'd disappoint their newly remarried parents. However, neither of them can accept the other as being the eldest sibling in the relationship. So they both agree to settle the matter with a game. Whoever does something in conflict with what people might consider normal sibling behavior, loses. Making them the younger sibling.
I'm in my own home, you know?
It's not that big of a deal.
.أنا في منزلي الخاصّ كما تعلم
.الأمر ليس مهمًّا لتلك الدّرجة
Ich wohne hier immerhin.
Ist doch nichts Ungewöhnliches.
Estoy en mi casa, ¿no? Es lo normal.
Estoy en mi casa, ¿no? No es nada raro.
Je suis chez moi,
il n’y a rien d’étrange.
Sono a casa mia, hai presente?
Non mi sembra una cosa strana.
Esta é minha casa,
o que tem de mais?
Я у себя дома.
Так что ничего страшного.