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.
Is it true you and Irido-san are stepsiblings?
هل صحيح أنّك وإيريدو-سان أخوان غير شقيقين؟
stimmt’s, dass ihr beide
Stiefgeschwister seid?
¿es cierto que Irido es tu hermanastra?
¿es cierto que Irido es tu hermanastra?
Paraît qu’Irido est ta sœur par alliance.
C’est vrai ?
È vero che tu e Irido-san siete fratellastri?
É verdade que você e a
Irido-san são meios-irmãos?
Вы с Иридо правда
сводные брат и сестра?