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.
He's getting redder by the second.
.إنّه يزداد احمرارًا مع كلّ لحظة تمرّ
Jetzt wird er auch ganz rot.
Está rojo como un tomate.
Está rojo como un tomate.
Regardez-le, il est tout rouge.
Sta arrossendo sempre di più.
Olha como ele está
todo avermelhado.
С каждой секундой всё краснее.