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 was finally getting used 
to how things are.
.كنت قد اعتدتُ على هذا الوضع أخيرًا
Dabei hatte ich mich
gerade dran gewöhnt …
Empezaba a acostumbrarme a la situación.
Empezaba a acostumbrarme a la situación.
il aurait fait une gaffe.
Finalmente mi ero abituata alla situazione.
Eu finalmente teria
resolvido as coisas.
Я только привыкла
к новой жизни.