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.
Gimme a break. It's the other way around.
.ما هذه السّخافة؟ العكس هو الصّحيح
Red mal keinen Stuss.
Das ist ja wohl andersrum.
No fastidies, es al revés.
No fastidies, que es al revés.
Rêve pas trop non plus.
C’est l’inverse.
Dacci un taglio. È il contrario.
Pare de sonhar.
É o contrário.
Не смешно. Всё наоборот.